
Thickening cream of mushroom soup in a crockpot can elevate this classic comfort dish to a richer, more indulgent level, perfect for pairing with meats, vegetables, or as a standalone side. While slow cookers are excellent for tenderizing ingredients, they often result in thinner sauces due to prolonged cooking times and moisture retention. Fortunately, there are several effective methods to achieve a luscious, creamy consistency, such as incorporating a roux, using cornstarch or flour as a thickening agent, adding cream cheese or heavy cream, or even relying on simmering with the lid off to reduce the liquid. Each technique offers unique benefits, allowing you to tailor the texture to your preference while maintaining the crockpot’s convenience.
| Characteristics | Values |
|---|---|
| Method 1: Roux | Mix equal parts butter and flour, cook until golden, then stir into crockpot. |
| Method 2: Cornstarch Slurry | Mix 1-2 tbsp cornstarch with cold water/broth, whisk into crockpot, and simmer. |
| Method 3: Flour Slurry | Mix 2 tbsp flour with cold liquid, add to crockpot, and cook until thickened. |
| Method 4: Cream Cheese | Add 4-6 oz softened cream cheese, stir until melted and thickened. |
| Method 5: Heavy Cream | Stir in 1/2 cup heavy cream and simmer until desired consistency. |
| Method 6: Mashed Potatoes | Add 1/2 cup mashed potatoes, stir until smooth and thickened. |
| Method 7: Arrowroot Powder | Mix 1-2 tsp arrowroot powder with cold liquid, add to crockpot, and simmer. |
| Method 8: Simmering | Remove lid, increase heat, and simmer to reduce liquid and thicken. |
| Cooking Time Adjustment | Thickeners may require additional 15-30 minutes of cooking time. |
| Stirring Requirement | Frequent stirring needed to avoid lumps and ensure even thickening. |
| Flavor Impact | Some methods (e.g., roux, cream cheese) add richness; others (e.g., cornstarch) are neutral. |
| Dietary Considerations | Gluten-free options: cornstarch, arrowroot powder; low-fat: avoid heavy cream. |
| Texture Result | Roux/cream cheese yield creamy texture; cornstarch/arrowroot yield glossy finish. |
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What You'll Learn
- Roux Method: Cook flour and butter, then add to crockpot for thickening
- Cornstarch Slurry: Mix cornstarch with water, stir into mushroom cream
- Cream Cheese Addition: Melt cream cheese into crockpot for richness and thickness
- Simmering Technique: Reduce liquid by simmering uncovered to thicken naturally
- Pureed Vegetables: Blend cooked veggies into soup for texture and body

Roux Method: Cook flour and butter, then add to crockpot for thickening
The roux method is a classic technique for thickening sauces and soups, and it works wonders for cream of mushroom in a crockpot. To begin, you’ll need equal parts of butter and flour. Start by melting 2-3 tablespoons of butter in a small skillet over medium heat. Once the butter is fully melted and starts to bubble slightly, add an equal amount of flour (2-3 tablespoons) and whisk it vigorously to combine. This mixture of cooked flour and butter is your roux, which will act as a thickening agent. Ensure the flour is fully incorporated and cook the roux for about 1-2 minutes, stirring constantly, to remove the raw flour taste. The roux should have a smooth, paste-like consistency and a light golden color.
After preparing the roux, let it cool slightly before adding it to your crockpot. This step is crucial because adding a hot roux directly to the crockpot can cause the cream of mushroom to curdle or separate. Once the roux is cool enough to handle, slowly whisk it into the crockpot mixture. Make sure to stir continuously as you add the roux to avoid lumps. The roux will begin to thicken the cream of mushroom as it heats up in the crockpot, so give it some time to work its magic. Depending on the desired thickness, you may need to wait 15-30 minutes for the sauce to reach the right consistency.
One of the advantages of using the roux method is its reliability and control over the thickness. If you find the cream of mushroom is not thick enough after adding the initial roux, you can always prepare a second batch and repeat the process. However, be cautious not to over-thicken the sauce, as it will continue to reduce and thicken slightly as it cooks in the crockpot. Always taste and adjust the seasoning after thickening, as the roux can sometimes dilute the flavor profile.
To ensure the roux integrates seamlessly, keep the crockpot on low to medium heat while adding it. High heat can cause the sauce to stick to the bottom or burn, so low and slow is the way to go. Once the roux is fully incorporated, give the cream of mushroom a good stir to ensure even distribution. You’ll notice the sauce starts to cling to the back of a spoon, indicating it’s reaching the desired thickness. If you’re adding additional ingredients like mushrooms or chicken, do so after the roux has been fully incorporated and the sauce has thickened.
Finally, remember that the roux method not only thickens but also adds a rich, velvety texture to your cream of mushroom. It’s a foolproof way to elevate your crockpot dish without altering the flavor significantly. Just be patient and allow the roux to do its job, and you’ll end up with a perfectly thickened, creamy mushroom sauce. This method is especially useful for crockpot recipes where you want a smoother, more refined texture without relying on cornstarch or other quick-fix thickeners.
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Cornstarch Slurry: Mix cornstarch with water, stir into mushroom cream
To thicken your cream of mushroom soup in a crockpot using a cornstarch slurry, start by preparing the slurry itself. In a small bowl, combine 2 tablespoons of cornstarch with 2 tablespoons of cold water, stirring until the mixture is smooth and free of lumps. The ratio of cornstarch to water is crucial, as too much cornstarch can make the sauce overly thick and gummy, while too little may not achieve the desired consistency. Ensure the mixture is well combined before proceeding to the next step.
Once your cornstarch slurry is ready, slowly stir it into the crockpot with the cream of mushroom soup. It’s important to add the slurry gradually while continuously stirring the soup to prevent clumping. The slow stirring action helps distribute the cornstarch evenly, ensuring a smooth and consistent texture. Avoid adding the slurry too quickly, as this can cause the cornstarch to settle at the bottom and create uneven thickening.
After incorporating the slurry, cover the crockpot and allow the soup to cook on low heat for an additional 15 to 20 minutes. This cooking time is essential, as it activates the cornstarch and allows it to thicken the soup properly. Stir the soup occasionally during this period to ensure even thickening and to prevent the bottom from burning. The soup should begin to visibly thicken as the cornstarch cooks and releases its starches into the liquid.
If you find that the soup is not thick enough after the initial 20 minutes, you can prepare an additional cornstarch slurry using the same method and stir it in. However, be cautious not to over-thicken the soup, as cornstarch can continue to thicken as it cools. Always taste and adjust the seasoning after thickening, as the added cornstarch may slightly dilute the flavor. This method is simple, effective, and ensures your cream of mushroom soup achieves the perfect consistency for serving.
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Cream Cheese Addition: Melt cream cheese into crockpot for richness and thickness
One effective way to thicken your cream of mushroom soup in a crockpot while adding a luxurious texture is by incorporating cream cheese. This method not only enhances the richness but also provides a smooth, velvety consistency. To begin, select a block of full-fat cream cheese, as it will yield the best results in terms of flavor and thickness. Allow the cream cheese to come to room temperature before adding it to the crockpot, as this ensures it melts evenly without leaving lumps. Once your cream of mushroom soup has been simmering for a while and the flavors have melded, it’s time to introduce the cream cheese.
Cut the cream cheese into small cubes to facilitate quicker melting. Gradually add the cubed cream cheese to the crockpot, stirring continuously with a whisk or a wooden spoon. The slow heat of the crockpot will gently melt the cream cheese, allowing it to blend seamlessly into the soup. Be patient during this process, as rushing it may result in uneven incorporation or lumps. Stirring consistently ensures that the cream cheese disperses evenly, creating a uniform thickness throughout the dish.
As the cream cheese melts, you’ll notice the soup taking on a richer, creamier appearance. This addition not only thickens the soup but also imparts a tangy, savory depth that complements the earthy flavors of the mushrooms. For best results, allow the soup to cook on low heat for an additional 15-20 minutes after adding the cream cheese. This extra time helps the flavors meld further and ensures the cream cheese is fully integrated into the soup.
If you prefer a smoother texture, consider using an immersion blender to briefly pulse the soup after the cream cheese has melted. This step is optional but can help achieve an even more luxurious consistency. Keep in mind that over-blending may affect the soup’s rustic appeal, so use this technique sparingly. The goal is to maintain the hearty essence of the cream of mushroom soup while enhancing its richness and thickness.
Finally, taste the soup and adjust the seasoning if needed. The cream cheese addition may slightly alter the balance of flavors, so a pinch of salt, pepper, or even a dash of garlic powder can elevate the final result. Serve the thickened cream of mushroom soup warm, perhaps with a sprinkle of fresh herbs or a side of crusty bread to complete the meal. The cream cheese method is a simple yet effective way to transform your crockpot soup into a decadent, restaurant-quality dish.
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Simmering Technique: Reduce liquid by simmering uncovered to thicken naturally
One of the simplest and most natural ways to thicken cream of mushroom soup in a crockpot is by using the simmering technique. This method involves reducing the liquid content by allowing the soup to simmer uncovered, which causes the water to evaporate and the sauce to thicken naturally. To begin, ensure your crockpot is set to a low or medium heat setting, as high heat can cause the soup to burn or stick to the bottom. Once your cream of mushroom soup has reached the desired cooking point, remove the lid to expose the surface to air. This step is crucial because it allows moisture to escape, facilitating the thickening process.
As the soup simmers uncovered, keep a close eye on it to monitor the consistency. Stir the soup occasionally to prevent it from sticking and to ensure even thickening. The simmering process can take anywhere from 30 minutes to an hour, depending on the initial liquid content and the desired thickness. Be patient, as rushing this step may lead to uneven results or burning. If you notice the soup starting to stick or burn, reduce the heat slightly and continue stirring more frequently. The goal is to achieve a smooth, creamy texture without compromising the flavor or integrity of the mushrooms and cream.
During the simmering process, you may also consider adjusting the seasoning to enhance the flavor as the liquid reduces. Taste the soup periodically and add salt, pepper, or herbs like thyme or parsley to balance the flavors. Remember, as the liquid evaporates, the flavors will concentrate, so it’s essential to ensure the seasoning is just right before the soup reaches the desired thickness. This technique not only thickens the soup but also deepens its flavor profile, making it richer and more satisfying.
Another tip to maximize the effectiveness of the simmering technique is to ensure the cream of mushroom soup has a good base of solids, such as sliced mushrooms, onions, or garlic. These ingredients release their natural starches and flavors as they cook, contributing to the overall thickness and taste of the soup. If your soup feels too liquidy even after simmering, you can lightly mash some of the mushrooms or vegetables to release more starch, aiding in the thickening process without adding extra ingredients.
Finally, once the soup has reached the desired thickness, turn off the crockpot and let it sit for a few minutes to cool slightly. This resting period allows the soup to stabilize and ensures the thickened consistency is evenly distributed. Serve the cream of mushroom soup warm, garnished with fresh herbs or a dollop of sour cream for added richness. The simmering technique is a straightforward, natural method that enhances both the texture and flavor of your crockpot cream of mushroom soup, making it a go-to approach for achieving the perfect consistency.
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Pureed Vegetables: Blend cooked veggies into soup for texture and body
One effective and nutritious way to thicken your cream of mushroom soup in a crockpot is by incorporating pureed vegetables. This method not only adds texture and body but also enhances the flavor and nutritional value of your soup. Start by selecting vegetables that complement the earthy flavor of mushrooms, such as carrots, cauliflower, or potatoes. These vegetables are starchy or fibrous, making them ideal for creating a smooth, thick consistency when blended. Simply chop the vegetables into uniform pieces, add them to your crockpot along with the other soup ingredients, and allow them to cook until they are tender. Once cooked, use an immersion blender directly in the crockpot or transfer a portion of the soup to a countertop blender to puree the vegetables until smooth.
When pureeing vegetables for thickening, it’s important to blend them thoroughly to avoid lumps and ensure a creamy texture. If using a countertop blender, blend in small batches and return the pureed mixture to the crockpot, stirring well to combine. The natural starches and fibers in the vegetables will release as they break down, naturally thickening the soup without the need for additional flour or cream. This technique is particularly useful if you’re aiming for a healthier version of cream of mushroom soup, as it reduces reliance on heavy creams or thickeners while maintaining a rich, satisfying mouthfeel.
For best results, consider the timing of when you add the vegetables to the crockpot. Adding them at the beginning of the cooking process allows them to soften fully and integrate seamlessly into the soup. However, if you’re short on time, you can partially cook the vegetables separately before blending and adding them to the crockpot toward the end of the cooking cycle. This ensures they are tender enough to puree smoothly without altering the overall cooking time of the soup. Experiment with different combinations of vegetables to find the balance of flavor and thickness that suits your taste.
Another tip is to season the soup after pureeing the vegetables, as the added thickness may require adjustments to salt, pepper, or other seasonings. Taste the soup and make any necessary tweaks to ensure the flavors are well-balanced. Pureed vegetables not only thicken the soup but also contribute to its color and depth of flavor, making it a versatile and practical technique for enhancing your cream of mushroom soup in the crockpot.
Finally, if you prefer a chunkier texture, you can puree only a portion of the vegetables and leave the rest in larger pieces. This creates a soup with both creamy and hearty elements, appealing to a variety of preferences. Whether you’re cooking for a family or meal prepping for the week, pureed vegetables are a simple, cost-effective, and wholesome way to thicken your cream of mushroom soup while elevating its overall quality.
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Frequently asked questions
You can thicken it by adding a slurry of cornstarch and water. Mix 1-2 tablespoons of cornstarch with an equal amount of cold water, then stir it into the crockpot. Cook on high for 15-20 minutes until thickened.
Yes, adding 4-6 ounces of softened cream cheese and stirring it in until melted can help thicken the soup and add a creamy texture.
Yes, simmering on low for an extended period (2-3 hours) can reduce the liquid and naturally thicken the soup, but adding a thickening agent will yield faster results.

























