How to Make a Cornstarch Slurry

Site Index Cornstarch Flour How-To

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A lot of recipes tend to call for a cornstarch slurry to be mixed in at the last minute to thicken. But how exactly do you make a flour or cornstarch slurry?

For more helpful guides on cooking at home, why not learn how to make an Egg Wash or make some Homemade Bisquick instead? 

cornstarch slurry

How to Make a Cornstarch Slurry

Making a cornstarch slurry is a really simple thing but requires a bit of understanding to do it properly. In fact, most people that frequently use starch slurries learned how to do it from a young age, so much so that it becomes second nature to them.

Common in Asian cuisines, starch slurries allow you to really easily thicken a soup or broth without having to prepare a roux beforehand and cook it at the very beginning of the recipe.

Thanks to the thickening power of either flour or cornstarch, what was previously a thin liquid mixture can instead be thickened into a more pleasant texture.

If you don’t know how to make a slurry yourself, it is absolutely a mandatory thing for any aspiring cook to learn at some point.

ingredients for cornstarch slurry

Flour or Cornstarch Slurry Ingredients

Make sure you look at the recipe card at the very bottom for the exact amounts.

• Cornstarch (or flour)

• Water

How To Make Flour or Cornstarch Slurry

• Combine the two ingredients until smooth and creamy

• Whisk rapidly into whatever soup or stew you need to thicken

• Continue to cook the dish until the sauce has thickened properly

whisking a cornstarch slurry

Differences Between Flour & Cornstarch Slurries

There are so many different recipes that call for some kind of starch slurry to help thicken everything. However, there is never really any explanation for when you should use flour slurry or a cornstarch one.

Though they are made of different types of grain, thanks to the relatively small amount of the slurry you actually use in a recipe, there isn’t really any kind of taste difference.

The main difference is the amount of further cooking that they require. A cornstarch slurry can thicken anything you put into it as soon as it has become completely mixed in and heated.

A flour slurry, meanwhile, requires a good amount of cooking before it actually starts to thicken. This is because the flour needs time to gelatinize before it can really thicken anything.

This is the reason that most recipes prefer to use cornstarch slurries rather than flour, though flour is obviously a lot more common than cornstarch in most homes.

A key thing to keep in mind for those that don’t live in the USA – cornstarch is sometimes called “cornflour” in other countries. Cornstarch should look like a very fine white powder, whereas cornmeal is the rougher, larger pieces of ground-up corn.

thickening chicken fricassee with a cornstarch slurry

How To Make Sure Your Mixture Thickens Properly

Most recipes that call for a starch slurry usually just say to mix it together and then dump it into your recipe, completely ignoring how to actually do it properly.

The key thing to do to make sure that your starch mixture thickens properly is to make sure that the starch is completely and totally mixed together before you use it.

A lot of people just mix it together using their fingers, but you can also use a small teaspoon or even a tiny whisk to get everything incorporated. If you don’t mix it properly, you can wind up with dry bits of starch remaining in your recipe, which means that it won’t thicken your food at all.

Looking for more delicious Kitchen Tips? Try these out:

How to Spatchcock a Chicken

How to Ripen Bananas

Hope that helps someone in the kitchen!



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How to make a cornstarch slurry to use in dishes to thicken sauces or broths.

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How to Make a Cornstarch Slurry

How to make a cornstarch slurry to use in dishes to thicken sauces or broths.
5 from 1 votes
Prep Time
2 minutes
Karlynn Johnston


  • 1 tablespoon cornstarch
  • 2 tablespoons water


  • Combine the two ingredients until smooth and creamy.
  • Whisk rapidly into the soup/stew that you need to thicken, until fully combined. Cook the dish until the sauce has thickened to your liking

Recipe Notes

  • You can double or triple this recipe as needed. 

All calories and info are based on a third party calculator and are only an estimate. Actual nutritional info will vary with brands used, your measuring methods, portion sizes and more.

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Karlynn Johnston

I’m a busy mom of two, wife & cookbook author who loves creating fast, fresh meals for my little family on the Canadian prairies. Karlynn Facts: I'm allergic to broccoli. I've never met a cocktail that I didn't like. I would rather burn down my house than clean it. Most of all, I love helping YOU get dinner ready because there's nothing more important than connecting with our loved ones around the dinner table!

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Site Index Cornstarch Flour How-To

Reader Interactions

Comments & Recipe Tips Share a tip or comment!

  1. Jason says

    I would start off using 2 cups cornstarch adding more for desired consistency.

  2. Barry Dodson says

    How much cornstarch for 4 cups of liquid, please? I have been making cornstarch slurry for years but always have to guess how much cornstarch to use. This means extra time trying to add more thickener or add more liquid, when I really want to just serve the dish. Also, for me a big difference in flour and cornstarch is that with flour I can brown the gravy by lightly toasting the flour in butter/bacon fat before adding the liquid. Again, correct proportions are important.

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