Baking

Cornstarch: what it is, how to pick and store it

A fine starch from corn that thickens sauces, gravies, stir-fries and pie fillings, and keeps a glossy finish. It's naturally gluten-free.

How to pick it

Stir it into a little cold liquid first (a slurry) so it doesn't lump, then simmer about a minute until it thickens and turns clear.

How to store it

Airtight and dry, in a cool cupboard.

Out of cornstarch? What to use instead

  • All-purpose flour: 2 tbsp flour for each 1 tbsp cornstarch. Sauces turn cloudy instead of glossy and a bit heavier.
  • Arrowroot: The same amount. Very clear and glossy; can turn slimy in dairy sauces.
  • Potato starch: The same amount. Thickens fast with a clear gloss; don't boil it long.
  • Tapioca starch: 2 tbsp for each 1 tbsp cornstarch. Glossy and a little stretchy; great in fruit pies, which stay clear after freezing.

Swaps for cornstarch, with what changes

Cornstarch: cups to grams

Cornstarch
MeasureGrams
1 cup128 g
½ cup64 g
⅓ cup43 g
¼ cup32 g
1 tablespoon8 g
1 teaspoon2.7 g

Weights from USDA FoodData Central. Cornstarch: converter and grams to cups

Recipes with cornstarch (23)

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Pick and store tips are in our own words. Storage times and safe temperatures are only shown where a U.S. government source gives them, named on each line; for anything not listed here, see USDA's FoodKeeper app.