Name: Homemade Oat Flour
Prep time: 5 min
Total time: 5 min
Ingredients: 2 cups old fashioned oats (certified gluten-free or purity protocol)

Whip up oat flour in just 5 minutes—using only gluten-free certified whole oats and a blender or food processor. Follow my simple step-by-step guide to turn oats into finely ground oatmeal flour with zero fuss!

A white bowl filled with oat flour sits on a rustic wooden surface, with some flour and oat flakes scattered around.

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Skill Level: Beginner

Allergy Watch: Nut Free, Dairy Free, No Eggs. Contains oats, so use caution.

I find making oat flour at home easier than buying store-bought. First off, it is much less expensive. I only need to have certified gluten free oats on hand, which saves cabinet space.

Oat flour has a slightly nutty flavor, perfect for both sweet and savory baking applications. And while it is most often used in baked goods, I like to use leftover flour for breading or batters.

Ingredient Notes

Use old-fashioned oats, rolled or steel cut, to make oat flour.
Do not use quick oats to make homemade oat flour.
Your oats should be dry, fresh oats work best so check the best by date on your packaging.
Remember that oats do not contain gluten but are often cross-contaminated. Only oat flour made from purity protocol or gluten-free certified oats is gluten-free.

How to Make Oat Flour

A step-by-step visual guide for making gluten-free oat flour. You can skip to the recipe for the full written instructions.

A food processor filled with rolled oats sits on a marble countertop next to a bowl of oats, a glass jar, and a white towel with a blue stripe.

Tools

Oats can be made in a food processor or a high-speed blender, like a Vitamix. For small batches (< ¼ cup) you can use a spice or coffee grinder.

Top view of an empty food processor bowl on a marble counter, next to a metal bowl filled with oats and a white kitchen towel with a blue stripe.

Pulse

Pulse the oats until they are ground into a fine flour consistency. This should take about 60 to 90 seconds.

A food processor contains freshly ground oat flour; whole oats are visible in a nearby metal bowl on a gray marble counter.

Check

Always stir to ensure that all the oats have been finely ground. Pulse until again, if needed.

Substituting Oat Flour in Recipes

Do not substitute one for one. Replace no more than ¼ of the total flour with oat flour.
If using oat flour in a gluten-containing (i.e. all-purpose or wheat) recipe that uses yeast, increase the yeast by 15%.
When using oat flour in gluten-free baking add additional xanthan gum.
When replacing oat flour with regular flour in recipes go by weight not volume. A small kitchen scale is helpful.
Oat flour substitutes better in recipes that have a binder and fat, like eggs and oil.
As will all gluten-free baking the batter needs to rest before using to allow the flour to hydrate a bit.

More GF Flour Recipes

Make Ahead and Storing

Make Ahead: Oat flours do not last as long as regular flours due to the oils in the oats

Storing: . Store the flour in an airtight container for 1 to 2 months.

Freezing: You can freeze oat flour for up to 3 months.

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