
Making cream of mushroom soup thicker is a common culinary challenge that can be addressed through several effective techniques. One popular method involves adding a roux, a mixture of equal parts butter and flour, which helps to create a smoother and richer consistency. Another approach is to incorporate a cornstarch slurry, where cornstarch is mixed with cold water or broth and then stirred into the soup to thicken it without altering the flavor. Reducing the soup by simmering it uncovered can also concentrate the flavors and achieve a thicker texture. Additionally, blending a portion of the mushrooms into a puree and adding it back to the soup can enhance both thickness and depth of flavor. Each method offers a unique way to achieve the desired consistency while maintaining the creamy, earthy essence of the dish.
| Characteristics | Values |
|---|---|
| Roux | Cook equal parts butter and flour to create a paste, then whisk into soup. |
| Cornstarch Slurry | Mix 1 tablespoon cornstarch with 2 tablespoons water, stir into simmering soup. |
| Flour | Sprinkle flour directly into soup, whisking constantly to avoid lumps. |
| Heavy Cream | Add heavy cream to enrich and thicken the soup naturally. |
| Cream Cheese | Stir in a few tablespoons of softened cream cheese for thickness and tang. |
| Pureed Mushrooms | Blend a portion of the cooked mushrooms and add back to the soup. |
| Potato | Add diced potato, cook until soft, then blend into the soup. |
| Arrowroot Powder | Mix 1 tablespoon arrowroot powder with water, stir into soup, and simmer. |
| Simmering | Reduce the soup over low heat to evaporate liquid and thicken naturally. |
| Blending | Use an immersion blender to puree part or all of the soup for thickness. |
| Cheese | Add grated cheese (e.g., Parmesan) to thicken and add flavor. |
| Milk and Flour | Whisk milk with flour, then gradually add to the soup while stirring. |
| Cauliflower | Cook and blend cauliflower into the soup for a low-carb thickener. |
| Tapioca Starch | Mix tapioca starch with water, stir into soup, and simmer to thicken. |
| Egg Yolk | Temper egg yolk with hot soup, then stir in for richness and thickness. |
| Instant Mashed Potatoes | Stir in a small amount of instant mashed potato flakes to thicken. |
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What You'll Learn
- Roux Method: Cook flour and butter, then add mushroom soup for thickness
- Cornstarch Slurry: Mix cornstarch with water, stir into soup until thickened
- Cream Addition: Use heavy cream or milk to naturally thicken the soup
- Blending Mushrooms: Puree part of the mushrooms to create a thicker texture
- Simmering: Reduce liquid by simmering longer for a concentrated, thicker consistency

Roux Method: Cook flour and butter, then add mushroom soup for thickness
The roux method is a classic technique to thicken sauces and soups, and it works wonders for cream of mushroom soup. This method involves cooking flour and butter together to create a paste, which is then used to thicken the soup. To start, melt an equal amount of butter in a saucepan over medium heat. For every cup of soup you want to thicken, use about 2 tablespoons each of butter and flour. Once the butter is melted, add the flour and whisk continuously to combine. This mixture is your roux, and it’s crucial to cook it properly to avoid a raw flour taste. Stir the roux constantly for about 2-3 minutes until it turns a light golden color and emits a nutty aroma. This step ensures the flour is fully cooked and will blend seamlessly into your soup.
After preparing the roux, it’s time to incorporate it into your cream of mushroom soup. Gradually whisk in a small amount of the hot mushroom soup into the roux to temper it. This prevents lumps from forming when you add the roux back into the soup. Once the roux is smooth and well combined with the small amount of soup, pour the roux mixture back into the main pot of mushroom soup. Stir continuously to ensure even distribution. As the soup heats up, you’ll notice it begins to thicken. Keep the soup at a gentle simmer, stirring occasionally, for about 5-10 minutes to allow the roux to fully integrate and thicken the soup to your desired consistency.
The roux method not only thickens the soup but also adds a rich, velvety texture that enhances the overall flavor. It’s important to monitor the heat and avoid boiling the soup vigorously, as this can cause the roux to separate or the soup to scorch. If you find the soup is too thick, you can always thin it out by adding a little more milk or broth. Conversely, if it’s not thick enough, you can prepare a small additional roux and repeat the process until you achieve the desired thickness.
One of the advantages of using the roux method is its versatility. You can adjust the amount of roux based on how thick you want your cream of mushroom soup to be. For a lighter consistency, use less roux, and for a heartier, more indulgent soup, add a bit more. Additionally, the roux method pairs well with other ingredients you might want to add to your soup, such as sautéed mushrooms, onions, or garlic, as it helps bind all the flavors together.
Finally, once your cream of mushroom soup has reached the perfect thickness, taste it and adjust the seasoning if needed. A pinch of salt, pepper, or a dash of cream can elevate the flavors even further. Serve the soup hot, perhaps with a sprinkle of fresh herbs or a slice of crusty bread on the side. The roux method ensures your cream of mushroom soup is not only thicker but also smoother and more luxurious, making it a satisfying dish for any meal.
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Cornstarch Slurry: Mix cornstarch with water, stir into soup until thickened
One of the most effective and straightforward methods to thicken cream of mushroom soup is by using a cornstarch slurry. This technique involves mixing cornstarch with water to create a smooth paste, which is then stirred into the soup to achieve the desired thickness. Cornstarch is a pure starch powder that acts as a powerful thickening agent, making it ideal for soups, sauces, and gravies. Unlike flour, cornstarch produces a glossy finish and doesn't add a starchy flavor, ensuring your cream of mushroom soup remains smooth and velvety.
To begin, measure out 1 tablespoon of cornstarch for every cup of soup you’re thickening. Adjust the amount based on how thick you want the final consistency to be. In a small bowl, combine the cornstarch with an equal amount of cold water (e.g., 1 tablespoon cornstarch with 1 tablespoon water). Whisk the mixture vigorously until it forms a smooth, lump-free slurry. It’s crucial to use cold water to prevent the cornstarch from clumping when added to the hot soup. Ensure the slurry is fully dissolved, as lumps can affect the texture of your soup.
Once the cornstarch slurry is ready, slowly pour it into the simmering cream of mushroom soup while continuously stirring. The soup should be at a gentle simmer, not a rolling boil, as high heat can cause the cornstarch to break down and lose its thickening power. Stir the soup in a circular motion to evenly distribute the slurry and prevent clumping. You’ll notice the soup beginning to thicken almost immediately, but continue stirring for about 1-2 minutes to ensure the cornstarch is fully activated and cooked.
Keep a close eye on the consistency as you stir, as the soup will continue to thicken slightly as it cools. If you find the soup isn’t as thick as you’d like, you can repeat the process with an additional cornstarch slurry, but do so sparingly to avoid over-thickening. Remember, a little cornstarch goes a long way, so it’s better to add it gradually and assess the consistency after each addition.
Finally, once the desired thickness is achieved, remove the soup from the heat and let it rest for a few minutes before serving. The cornstarch slurry not only thickens the soup but also adds a subtle sheen, enhancing its overall appearance. This method is quick, efficient, and preserves the rich, creamy flavor of the mushroom soup, making it a go-to technique for achieving the perfect texture.
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Cream Addition: Use heavy cream or milk to naturally thicken the soup
One of the simplest and most effective ways to thicken cream of mushroom soup is by incorporating heavy cream or milk. This method not only adds richness but also naturally enhances the soup’s texture without relying on artificial thickeners. To begin, ensure your soup is simmering gently over medium heat. Slowly pour in ½ to 1 cup of heavy cream (or whole milk for a lighter option) while stirring continuously. The gradual addition allows the cream to blend seamlessly with the soup, preventing curdling or uneven consistency. Heavy cream, with its higher fat content, provides a luxurious mouthfeel and a more pronounced thickness compared to milk. However, both options work well depending on your preference for richness.
When using milk, it’s important to note that it may not thicken the soup as much as heavy cream due to its lower fat content. To compensate, you can simmer the soup for a few extra minutes after adding the milk to allow some of the liquid to evaporate, naturally concentrating the texture. If you’re concerned about the soup being too thin, consider using evaporated milk, which has a thicker consistency and adds creaminess without diluting the flavor. Regardless of your choice, always add the dairy slowly and stir thoroughly to ensure it integrates fully into the soup.
For best results, add the cream or milk toward the end of the cooking process. This prevents the dairy from overheating, which can cause it to separate or develop a grainy texture. Once the cream is incorporated, let the soup simmer for 5–10 minutes to allow the flavors to meld and the texture to thicken. Avoid boiling the soup vigorously after adding the cream, as this can cause it to curdle or lose its smooth consistency. Instead, maintain a gentle simmer to achieve the desired thickness.
If you’re looking to enhance the flavor while thickening, consider infusing the cream with herbs or spices before adding it to the soup. For example, heat the cream with a sprig of thyme or a pinch of nutmeg, then strain it before incorporating it into the soup. This adds depth to the dish while ensuring the cream contributes both texture and flavor. Remember, the goal is to strike a balance between thickness and taste, so adjust the amount of cream or milk based on your desired consistency and the overall volume of the soup.
Finally, always taste and adjust seasoning after adding the cream or milk, as dairy can mellow the flavors of the soup. A pinch of salt, pepper, or a squeeze of lemon juice can brighten the dish and bring all the elements together. With this cream addition method, you’ll achieve a velvety, rich cream of mushroom soup that’s naturally thickened and full of flavor. It’s a straightforward technique that elevates the dish without complicating the process.
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Blending Mushrooms: Puree part of the mushrooms to create a thicker texture
One effective way to thicken cream of mushroom soup is by blending a portion of the mushrooms into a smooth puree. This technique not only adds body to the soup but also enhances its earthy flavor. Start by setting aside about one-third to one-half of the cooked mushrooms from your soup. These will be the ones you puree. Using an immersion blender, regular blender, or food processor, blend the reserved mushrooms until they form a silky, lump-free puree. If you’re using a regular blender, allow the mushrooms to cool slightly before blending to avoid pressure buildup, and then return the puree to the soup pot.
When incorporating the mushroom puree, ensure the soup is at a low simmer. Gradually stir the puree back into the soup, allowing it to mix evenly with the remaining whole or sliced mushrooms and the creamy base. The natural starches and fibers in the mushrooms will help thicken the soup without altering its flavor profile. This method is particularly useful if you prefer to avoid adding extra flour, cornstarch, or cream as thickeners.
For best results, cook the mushrooms until they release their moisture and brown slightly before blending. This step concentrates their flavor and ensures the puree adds depth to the soup. If your soup still feels too thin after adding the puree, you can repeat the process with additional mushrooms or simmer the soup uncovered for a few minutes to reduce and thicken further.
Blending mushrooms is a simple, ingredient-conscious approach that leverages the soup’s existing components to achieve the desired consistency. It’s ideal for those seeking a richer texture without relying on traditional thickeners. Just remember to blend the mushrooms thoroughly to avoid any chunks, as a smooth puree is key to seamlessly thickening the soup.
Finally, taste the soup after blending in the mushroom puree and adjust the seasoning if needed. The added thickness should complement the creamy, savory flavors of the dish. This method not only solves the thickness issue but also elevates the overall mushroom essence of the soup, making it a go-to technique for cream of mushroom enthusiasts.
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Simmering: Reduce liquid by simmering longer for a concentrated, thicker consistency
Simmering is one of the most effective and traditional methods to thicken cream of mushroom soup, relying on the natural reduction of liquid to achieve a richer, more concentrated consistency. The process involves cooking the soup over low to medium heat for an extended period, allowing the water content to evaporate gradually. As the liquid reduces, the flavors become more intense, and the soup naturally thickens without the need for additional thickeners. This method is particularly ideal for those who prefer a more hands-off approach and want to enhance the soup’s depth of flavor.
To begin simmering, ensure your cream of mushroom soup is already prepared with its base ingredients, such as mushrooms, broth, cream, and seasonings. Place the soup in a heavy-bottomed pot or saucepan to prevent burning and promote even heating. Set the stove to medium-low heat and let the soup come to a gentle simmer. Avoid boiling, as high heat can cause the cream to curdle or separate, ruining the texture. Stir the soup occasionally to prevent sticking and ensure even reduction.
The key to successful simmering is patience, as this method can take anywhere from 15 to 30 minutes or longer, depending on the desired thickness. Keep an eye on the soup’s consistency, using a spoon to test its texture periodically. As the liquid reduces, you’ll notice the soup clinging more to the spoon, indicating it’s thickening. If you’re aiming for a very thick consistency, you may need to simmer for an additional 10–15 minutes, adjusting the heat as needed to maintain a steady simmer.
During the simmering process, taste the soup occasionally and adjust the seasoning if necessary. As the liquid reduces, the flavors become more concentrated, so you may need to add a pinch of salt, pepper, or herbs to balance the taste. Additionally, if the soup becomes too thick before the flavors are fully developed, you can add small amounts of broth or water to adjust the consistency without diluting the flavor.
Once the cream of mushroom soup reaches your desired thickness, remove it from the heat and let it rest for a few minutes before serving. Simmering not only thickens the soup but also enhances its overall richness and complexity, making it a satisfying and flavorful dish. This method is particularly rewarding for those who enjoy the process of slow cooking and appreciate the natural transformation of ingredients over time.
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Frequently asked questions
You can thicken cream of mushroom soup by adding a cornstarch slurry (mix 1 tablespoon cornstarch with 2 tablespoons water) or blending a portion of the soup until smooth.
Yes, adding heavy cream can make the soup richer and thicker, but it won’t significantly alter the consistency unless simmered to reduce.
Yes, adding mashed potatoes or instant potato flakes can thicken the soup while adding a subtle earthy flavor.
Simmering the soup reduces the liquid content, naturally thickening it without the need for additional ingredients.
Yes, adding grated cheese like Parmesan or cheddar can thicken the soup slightly while enhancing its flavor.
























