How to Thicken Soup With Corn Starch

Measure the soup's volume before beginning.
Measure the soup's volume before beginning. (Image: Jupiterimages/Goodshoot/Getty Images)

Cornstarch is obtained from the kernel of the maize plant.You can use it in cooking as a thickening agent for liquids such as sauces, gravies and broths. If you add too much water or broth to a soup, you can use cornstarch to thicken it to your preference. Using cornstarch, you can transform soup with broth no thicker than water to a gravy-like consistency, and anywhere in-between. Thickening soup with cornstarch requires approximately 15 minutes.

Things You'll Need

  • Water
  • Small microwave-safe bowl
  • Cornstarch
  • Whisk
  • Wooden spoon

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Pour 3 tbsp. water into a small bowl for every 3 cups of soup you need to thicken. Microwave in 15-second increments until it boils.

Add 4 tbsp. cornstarch to the boiling water for every 3 cups of soup. Whisk the cornstarch into the water until it forms a smooth consistency.

Pour the water and cornstarch mixture into your soup and stir with a wooden spoon for 60 seconds. Simmer the soup for 15 minutes over low heat.

Sample the soup’s broth. If it is not thick enough for your taste, make a second batch of water and cornstarch and repeat the process.

Tips & Warnings

  • If you do not whisk the cornstarch into the water completely, it will create tasteless lumps in your soup.


  • "Cooking Basics for Dummies"; Bryan Miller, Marie Rama and Eve Adamson; 2011
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