How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (2024)

  • How to Cook

Learn how to thicken a sauce with just two simple ingredients: flour or cornstarch. Plus, get a gluten-free thickener option, too.

By

Katlyn Moncada

How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (1)

Katlyn Moncada

Katlyn Moncada is the associate food editor at BHG.com, sharing food news and tutorials on becoming better home cooks. She is a writer and editor with nearly a decade of experience in digital media, photography, and video production.

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Updated on August 28, 2023

Fact checked by

Marcus Reeves

How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (2)

Fact checked byMarcus Reeves

Marcus Reeves is an experienced writer, publisher, and fact-checker. He began his writing career reporting for The Source magazine. His writing has appeared in The New York Times, Playboy, The Washington Post, and Rolling Stone, among other publications. His book Somebody Scream: Rap Music's Rise to Prominence in the Aftershock of Black Power was nominated for a Zora Neale Hurston Award. He is an adjunct instructor at New York University, where he teaches writing and communications. Marcus received a Bachelor of Arts degree from Rutgers University in New Brunswick, New Jersey.

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In This Article

  • How to Use Flour to Thicken Sauce
  • How to Use Cornstarch to Thicken Sauce
  • Substituting Cornstarch for Flour as a Gluten-Free Alternative
  • Other Thickening Agents

Have you ever tried to twirl a bite of pasta that, by the time it reaches your mouth, seems to have no sauce? Here are some tips on using flour or cornstarch to thicken sauces—items likely already in your pantry. Improve the viscosity of sauces and gravy, so you enjoy their rich flavor in every bite, and make your soups more substantial and filling with this technique.

How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (3)

How to Use Flour to Thicken Sauce

To use flour as a thickening agent:

  1. Use two tablespoons flour mixed with ¼ cup cold water for each cup of medium-thick sauce.
  2. Thoroughly mix in the water to prevent lumps.
  3. After stirring the combined flour and water into the sauce, cook and stir over medium heat until thickened and bubbly.
  4. Heat one minute more to cook the flour thoroughly.

How to Use Cornstarch to Thicken Sauce

Using cornstarch to thicken sauce is very similar to using flour, but you need different quantities:

  1. Use one tablespoon cornstarch mixed with one tablespoon cold water (aka a cornstarch slurry) for each cup of medium-thick sauce.
  2. Thoroughly mix the cornstarch and water together, then pour into your sauce.
  3. Cook and stir over medium heat until thickened and bubbly.
  4. Heat two minutes more in order to completely cook the cornstarch.

Test Kitchen Tip

Be careful not to overcook cornstarch-thickened sauces. They can break down when overcooked (the starch loses its thickening properties when cooked too long).

Substituting Cornstarch for Flour as a Gluten-Free Alternative

If you have someone in the family with an allergy restriction, you may need a gluten-free thickener for your soup recipe. It's important to note that cornstarch has twice the thickening power of flour. If you need to substitute cornstarch to thicken liquid in a recipe that calls for ¼ cup (four tablespoons) flour, you only need two tablespoons cornstarch. If you're substituting flour for cornstarch to thicken the sauce in your recipe, substitute two tablespoons all-purpose flour for every one tablespoon cornstarch.

Test Kitchen Tip

We don't recommend freezing cornstarch-thickened mixtures, as the freezing process breaks down the starch-thickening properties.

Gluten-Free Buttermilk Biscuits with Sausage Gravy

How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (4)

Other Thickening Agents

There are options other than flour and cornstarch to thicken foods. When it comes to thickening soup and other sauce-based recipes, you can make a roux (a mixture of flour and fat). This is common for creamy soups like baked potato soup and sauces like macaroni and cheese. (Get the full instructions on how to make roux here.)

Depending on your recipe, you can use eggs, a roux, or a puree of ingredients for a liquid thickener. The soup thickener depends on the recipe because some thickening agents can affect the soup's flavor.

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Put those thickening skills to good use by making chicken marsala for dinner or a delicious turkey gravy for your Thanksgiving feast. You can also make some sweet additions to your menus with a raspberry-rhubarb waffle topper or lemon curd.

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How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup (2024)

FAQs

How to Use Flour or Cornstarch to Thicken Sauce, Gravy, and Soup? ›

Browning adds more flavor to the gravy and gets rid of the raw flour taste. You're basically making a roux. We find that a flour-based gravy holds up better and reheats better later, which is why we tend to prefer using flour over cornstarch to make gravy unless we have a guest who is eating gluten-free.

Is it better to thicken gravy with cornstarch or flour? ›

Browning adds more flavor to the gravy and gets rid of the raw flour taste. You're basically making a roux. We find that a flour-based gravy holds up better and reheats better later, which is why we tend to prefer using flour over cornstarch to make gravy unless we have a guest who is eating gluten-free.

Is it better to thicken soup with flour or cornstarch? ›

The most classic and surefire way to thicken a broth-based soup is with a cornstarch slurry. Whisk together equal parts cornstarch (or arrowroot) and water or broth, then whisk it into the pot of soup. A good ratio to get to a pleasant thickness without your soup tasting goopy or heavy is one tablespoon.

Why can't you add straight cornstarch to a sauce or soup? ›

Cornstarch is a common thickening agent in the culinary arts, but if you add it directly to the liquid you want to thicken, it will clump up. To thicken a sauce or soup with cornstarch, you first need to make a slurry, which is a mixture of equal parts cornstarch and liquid (usually water, stock or wine).

How much cornstarch to thicken 3 cups of liquid? ›

If you're cooking hot liquids like sauces, stock or broth, 1 tablespoon of corn starch per cup of liquid will give you a thin to medium consistency that's appropriate for soups or very thin sauces. 2 tablespoons per cup will give you a thicker, more gravy-like consistency.

What is the best thickening agent for gravy? ›

Cornstarch isn't just a handy all-around kitchen staple to keep in your pantry—it's also a gluten-free gravy thickener that saves the day for the gluten-averse.

Does cornstarch have to boil to thicken? ›

Cornstarch needs heat (in the ballpark of 203°F) in order for “starch gelatinization”—that is, the scientific process in which starch granules swell and absorb water—to occur. In other words, if you don't heat your cornstarch to a high enough temperature, your mixture will never thicken.

What do restaurants use to thicken sauces? ›

List of Thickening Agents
  • Corn Starch. The most common of all the starches, corn starch is derived from corn, making it vegan and gluten-free, as well as transparent and relatively flavorless. ...
  • Xanthan Gum. ...
  • Gelatin. ...
  • Pectin. ...
  • Potato Starch. ...
  • Tapioca Starch. ...
  • Arrowroot. ...
  • Agar-Agar.

How do you add cornstarch to soup without clumping it? ›

For the best results, never add flour or cornstarch directly to your soup. If you do, it will clump up on top. Instead, ladle a small amount of broth into a separate bowl and let it cool. Add a few tablespoons of flour or cornstarch to the bowl and whisk until it's blended smooth.

Do you mix cornstarch with hot or cold water? ›

Cornstarch has twice the thickening power of flour. When a gravy, sauce, soup or stew recipe calls for flour, use half as much cornstarch to thicken. To thicken hot liquids, first mix cornstarch with a little cold water until smooth. Gradually stir into hot liquid until blended.

How much cornstarch for 3 cups of gravy? ›

Use one tablespoon cornstarch mixed with one tablespoon cold water (aka a cornstarch slurry) for each cup of medium-thick sauce. Thoroughly mix the cornstarch and water together, then pour into your sauce. Cook and stir over medium heat until thickened and bubbly.

How to fix too much cornstarch in sauce? ›

It should look like gravy. So if you added too much cornstarch, you can always dilute it. with a little bit more chicken stock or water. If you're thinking it too much, it looks like pudding.

Why is my cornstarch slurry not thickening? ›

To further ensure a smooth texture, temper the slurry by adding a small amount of the hot liquid to the slurry first, stirring it until it's well combined, then slowly incorporating it into the hot recipe. Avoid overcooking. Cornstarch can lose its thickening power if overcooked for a long time.

Does cornstarch thicken faster than flour? ›

Compared to flour, cornstarch thickens a mixture faster and has a cleaner flavor; it also produces a clearer gel.

How to thicken runny gravy? ›

Mix one tablespoon of cornstarch with one cup of cold water, whisking the mixture together until the cornstarch granules dissolve. Stir this mixture into your gravy on low heat. You can use arrowroot powder, tapioca flour, or potato starch as a thickener if you don't have cornstarch.

Do you use cornstarch or flour for a roux? ›

Roux is commonly made with flour, but you can also sub in cornstarch or arrowroot powder. Mix the cornstarch or arrowroot powder with water to form a slurry before adding it to the pan and cooking it with the fat.

Which is healthier cornstarch or flour? ›

Share on Pinterest Wheat flour is more nutritious than cornstarch. Wheat flour is a nutritious alternative to cornstarch, with a higher protein content, fewer carbohydrates, and more dietary fiber than cornstarch. It also contains more vitamins and minerals.

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