How To Heat Treat Flour

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Edible cookie dough, brownie batter, and no-bake treats all have one thing in common: heat-treated flour! My tutorial will show how to do it right in your microwave or oven.

Looking for a classic dessert recipe? Try my soft and chewy sugar cookies!

Heat treated flour on a lined baking sheet.

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When To Heat Treat Flour

Raw flour can contain harmful bacteria, like E. coli. So if you’re making no-bake treats, like edible cookie dough or brownie batter, make sure to heat-treat your flour first to reduce any risk.

NOTE:, home ovens and microwaves can vary in temperature and distribution. So, DIY heat treating is considered a risk-reduction step, rather than a guaranteed sterilization method. For best results, stir well and check multiple spots with a thermometer to ensure even heating. Or, you can purchase commercially heat-treated flour instead.

Heat treated flour on a lined baking sheet.

How to Heat Treat Flour

There are two ways to heat treat flour: by baking it or microwaving it!

For the microwave method, add flour to a microwave-safe plate or bowl. Microwave at 15-second intervals, stirring in between, or until the flour reaches 165°F/74°C. This should take between 1-2 minutes. Let fully cool and make sure to sift the flour to get rid of any clumps before using!

For the oven method, add flour to a lined baking sheet. Bake at 350°F/177°C for 7-10 minutes, stirring halfway, until the flour reaches 165°F/74°C. Let fully cool, and make sure to sift the flour to get rid of any clumps before using!

For full instructions, see the recipe card below.

Heat treated flour on a fluted plate.

Storage

You can store fully cooled heat-treated flour in an airtight container at room temperature for up to 3 months.

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Heat treated flour on a lined baking sheet.

How To Heat Treat Flour

Bianca Fernandez
Looking to make edible cookie dough or brownie batter? Make sure to follow my tutorial on how to heat treat flour to reduce any risk associated with raw flour!
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Prep Time 10 minutes
Total Time 10 minutes
Course Dessert
Cuisine American
Servings 1 cup

Equipment

Ingredients 

  • 1 cup (125 g) all-purpose flour

Instructions 

    Raw flour is not considered ready-to-eat and may contain harmful bacteria, such as Salmonella or E. coli.
    Heating flour to approximately 165°F/74°C can help reduce harmful bacteria when the flour is heated evenly throughout. However, home ovens and microwaves can vary in temperature and distribution. Therefore, this recipe uses a a risk-reduction step rather than a guaranteed sterilization method.
    For best results, stir well and check multiple spots with a thermometer to ensure even heating, OR purchase commercially heat-treated flour.
    Individuals who are pregnant, elderly, immunocompromised, or otherwise at higher risk for foodborne illness may wish to avoid consuming raw flour products entirely.

Microwave method:

  • In a microwave-safe bowl or plate, add 1 cup (125 g) all-purpose flour.
  • Microwave at 15-second intervals, stirring in between, until the flour reaches 165°F/74°C.
  • Let fully cool. Make sure to sift before using, since it might be clumpy.

Oven method:

  • Preheat oven to 350°F/177°C. Line baking sheet with parchment paper.
  • Evenly spread 1 cup (125 g) all-purpose flour on top of lined baking sheet. Bake for 7-10 minutes, stirring halfway, until the flour reaches 165°F/74°C.
  • Let fully cool. Make sure to sift before using, since it might be clumpy.

Notes

Store cooled heat-treated flour in an airtight container at room temperature for up to 3 months.
Serving: 1 servingCalories: 455kcalCarbohydrates: 95gProtein: 13gFat: 1gSaturated Fat: 0.2gPolyunsaturated Fat: 1gMonounsaturated Fat: 0.1gSodium: 3mgPotassium: 134mgFiber: 3gSugar: 0.3gVitamin A: 3IUCalcium: 19mgIron: 6mg

The nutritional information is an estimated value per serving.

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