How To Make Oat flour (+ FAQs)

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How to make oat flour in just minutes, with one ingredient and a food processor or blender. Gluten-free oat flour is perfect for adding to sweet and savory recipes!

Oat flour on a wooden surface

I’ve already shared several homemade DIYs for you, including Almond Flour and Chickpea Flour. Now, it’s the turn for Oat flour – a true pantry staple in my household and one I’ll never (ever) buy. All you need to make oatmeal flour is some oats and a high-speed blender/food processor or spice grinder. Yup, that’s it! Within minutes you then have homemade oat flour ready to use immediately or store for later.

Within this post, I’ll take you through how to make it, suggested oat flour recipes, some top tips, and several FAQs – including storage instructions and substitutions. So, let’s jump right in!

What Is Oat Flour?

In some instances, when making ‘flour’ from an ingredient, it isn’t quite as simple as DIY oat flour. Oatmeal flour is simply a product made from the ground/blended rolled oats.

Oat flour in a grinder

If you’re wondering whether it is ‘healthy,’ then it is as healthy as the oats used to create it. Avoid quick oats, which are often processed! – rolled oats are the way to go!

Oat flour is gluten-free, wholegrain, and a wonderful source of several vitamins, minerals, antioxidants, and fiber! Oats also contain large amounts of a powerful soluble fiber, Beta-Glucan. Beta-Glucan is great for reducing ‘bad’ LDL cholesterol levels and reducing blood sugar levels. It also helps to increase the feeling of fullness for longer. Best of all, it’s beneficial for healthy gut bacteria.

You could also blend steel-cut oats into flour. Though, they take longer to blend and aren’t something I use often. Interestingly, they have a higher yield, though – as one cup of steel-cut oats makes around 2 cups oatmeal flour.

Oats in a heart shaped bowl

Once ground, your gluten-free oat flour is perfect for adding to baked goods, smoothies, and more – check out a list of my favorite uses at the bottom of the post!

How To Make Oat Flour

Add the rolled oats to a blender, food processor, or spice grinder and blend into a powder.

Depending on the amount you’re grinding, you may need to do it in batches ( \especially if using a spice grinder).

Steps for grinding oats

When using a blender/food processor, stop the machine occasionally, give the jug a jiggle to get all the oats back to the bottom, and continue to blitz until you have a fine powder.

For very fine flour, then sieve the mixture and re-grind/blend the larger bits if necessary.

Sieving oat flour

When ready, use immediately or transfer the flour into a large airtight glass jar.

How To Store

Homemade oat flour can be stored for several months (3-4) in a cool, dry location.

The shelf life will also depend on how fresh the oats are in general and their BBE date, so note that before blending it into oatmeal flour.

FAQs

What is the oat to oat flour conversion?

I’ve found that it’s basically a 1:1 conversion. One cup of rolled oats makes around one cup of flour (usually just slightly less) – so feel free to double-check to get exact amounts.

Is it gluten-free?

Yes, but make sure to use certified gluten-free oats. While oats are naturally gluten-free, not all of the facilities that handle them are – so there is a small chance of cross-contamination.

Should oat flour be refrigerated/ frozen?

It doesn’t have to be. Just like the whole oats, the flour is shelf-stable. However, if you want to store the oatmeal flour in the freezer, it can extend its shelf life to up to 12 months.

Can oat flour be substituted for all-purpose?

No, as with most gluten-free flour options, a 1:1 substitution usually won’t work. In fact, in many gluten-free recipes, you’ll note that several different flour types are used to achieve the correct texture, dryness, consistency, etc. It’s best to find recipes that specifically call for the flour (or at least advise you on how much to use as a sub).

Can oat flour be eaten raw?

Yes, as they are just oats – feel free to use them for raw purposes. This includes adding to smoothies as a thickener, for raw vegan cookie dough, etc. Some people may have digestive issues with eating them raw – in which case, lay the oats out in a thin layer and bake in the oven for a few minutes at 350ºF/180ºC before blending into a powder – but this isn’t usually necessary.

Can I use instant oats or steel-cut oats instead of rolled oats?

Yes, technically, you can use any of the above. I’d avoid instant oats as they often contain more processing and additives. Steel-cut oats take longer to process but yield more flour (double the amount).

Oat flour in a heart shaped bowl

Oat Flour Recipes & Uses

There are tons of ways to use this. Here are just a few of my top suggestions.

Let me know in the comments what some of your other favorite uses are!

Let me know in the comments if there are other flours and pantry staple DIYs you’d like me to share!

If you make this oat flour, then let me know your thoughts and questions in the comments. I’d also really appreciate a recipe rating and would love to see your recreations – just tag @AlphaFoodie.

How To Make Oat Flour

5 from 3 votes
By: Samira
Make homemade oat flour in minutes – a versatile, gluten-free, wholegrain flour perfect for sweet and savory bakes.
Prep Time: 5 minutes
Total Time: 5 minutes

Ingredients  

  • oats

Instructions 

  • Add the rolled oats to a blender, food processor, or spice grinder and blend into a powder.
    Depending on the amount you're grinding, you may need to do it in batches (especially if using a spice grinder).
    When using a blender/food processor, stop the machine occasionally, give the jug a jiggle to get all the oats back to the bottom, and continue to blitz until you have a fine powder.
  • For very fine flour, then sieve the mixture and re-grind/blend the larger bits if necessary.
  • When ready, use immediately or transfer the flour into a large airtight glass jar.

How To Store

  • Homemade oat flour can be stored for several months (3-4) in a cool, dry location.
    The shelf life will also depend on how fresh the oats are in general and their BBE date, so note that before blending it into oat meal flour.

Video

Notes

Check out the blog post for lots of recipe suggestions and FAQs.
Course: DIYs
Cuisine: American
Freezer friendly: 1 Year
Shelf life: 4 Months

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