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How to Thicken French Onion Soup: 8 Easy Ways

Thickening French onion soup is very simple.
You will want to use either flour or cornstarch.
A teaspoon of each is all you need for thickening.
If you are looking for a thicker soup, then you may want to add a bit more than a teaspoon.
Prep Time3 mins
Active Time3 mins
Total Time6 mins
Course: Soup
Cuisine: French
Keyword: How to Thicken French Onion Soup
Cost: 1


  • Use Cornstarch to Thicken the Soup
  • Potato Starch
  • Mix in A Small Amount of Flour
  • Use a Starch to Thicken the Soup
  • Make a Roux, Then Add It to The Soup
  • Egg Yolk
  • Stir in Some Cream Cheese
  • Pureed Vegetables