Oat Flour Brownies

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Oat Flour Brownies are naturally gluten-free, with a perfectly fudgy texture. They taste like the real thing, and I love how you don’t need to use multiple flours, or nut butters, to make this recipe. It couldn’t be easier!

oat flour brownies stacked in front of black wall

What You Should Know About Using Oat Flour

Oat flour is naturally gluten-free, but it’s important to know that oats can be contaminated with other gluten-containing grains during the manufacturing process. So, be sure to buy a package that is labeled “certified gluten-free” if you are serving these brownies to someone who is sensitive to gluten.

Tip: You can make homemade oat flour, too! In my tutorial, I’ll walk you through how to swap oat flour in other recipes using a simple formula. All you need is oatmeal to get started.

Making an oatmeal brownie also requires some patience, because oat flour tends to be crumbly when compared to other gluten-containing flours.

There are two ways to battle this:

  • Use more eggs for structure (if you use 2 eggs, you’ll get a cake-like brownie)
  • Wait for the brownies to cool completely (this is your only option if you want a fudgy brownie)

If you cut into oat flour brownies while they are warm, they will start to fall apart as you slice them. This is probably no big deal if you’re just making these for your family at home, but if you want nicely sliced brownies, you’ll need to wait for these to cool down completely.

When they are totally cool, they firm up and will slice much better!

Ingredients You’ll Need

oat flour brownie ingredients in glass bowls on white surface

What’s in oat flour brownies?

  • Oat flour (which is simply ground-up oatmeal)
  • Butter
  • Granulated sugar (I use coconut sugar)
  • Egg
  • Cacao powder
  • Vanilla
  • Salt

The combination is super-simple, and the results are delicious! No starches or gums required for this gluten-free brownie recipe.

If you want to make vegan brownies, you can use coconut oil as a swap for the butter, and use a flax egg instead of the chicken egg. (See the notes in the recipe below for tips!) The brownies will be slightly more fragile in this instance, so just keep that in mind.

How to Make Oat Flour Brownies

1. Mix. Add the oat flour, coconut sugar, cacao powder, baking soda and salt to a large bowl, and whisk to combine.

Then add in the wet ingredients, starting with the melted butter, followed by the egg. (Make sure the melted butter isn’t too hot, so it won’t start to cook the egg.) Stir well, creating a thick batter, then fold in the chocolate chips.

oat flour brownie batter mixed in glass bowl

2. Bake. Lightly grease an 8-inch square baking dish, then press a piece of parchment paper into the bottom of the pan, so the brownies will be easy to remove later.

Transfer the batter to the prepared pan, and use a spatula to flatten the batter into the bottom of the dish evenly. It will be thick, and not super-easy to spread. You can sprinkle a few extra chocolate chips on top, if you’d like to!

Bake these oat flour brownies at 350ºF for 20 to 25 minutes. The brownies might still look jiggly in the middle when you remove them from the oven, but they will firm up as they cool.

oat flour brownies pressed into pan with chocolate chips on top

Note: I originally started baking these brownies for 30 minutes to get rid of the jiggle in the center, but the brownies become too crispy around the edges for me with that cooking time. If you like brownies with a softer, almost gooey center, then go with the shorter cooking time.

3. Cool completely. These brownies will be very fragile when they are warm! Do not slice them until they are totally cool, which can take up to 2 hours depending on the temperature of your kitchen. Gluten-free baked goods tend to be crumbly, but this issue improves greatly when the brownies are at room temperature, or chilled.

When the brownies are no longer warm, you can use a sharp knife to slice them into 16 pieces. The edge pieces will get crispy, and the middle pieces are almost fudge-like. (My favorite!)

sliced oat flour brownies on parchment paper

Note: These brownies will rise more around the edges and are slightly more flat in the center. This doesn’t seem to be an issue for my family members who all love them, but I thought I’d mention that this is “normal” if you experience it, too.

Store any leftover brownies in an airtight container in the fridge for up to 1 week, or you can freeze these for up to 3 months.

 Substitutions & Variations

oat flour peppermint brownies stacked in front of garland

Can I make brownies without eggs? If you don’t mind a slightly more fragile brownie, you can make this recipe with a flax egg instead. However, for more sturdy results you might prefer to make another recipe instead, like my other gluten-free brownies.

Can I use something other than butter? You can most likely use a 1/3 cup of coconut oil as a swap for butter, since it firms up when chilled. (I haven’t had the chance to test this yet myself, so experiment at your own risk!) If you want a lower-fat recipe, you can swap half of the butter for unsweetened pumpkin puree, but the resulting brownie will be more cake-like in that case.

Can I use a different flour? I wouldn’t make substitutions in this exact recipe, but be sure to check out my other tested brownie recipes below, if you need to use another ingredient.

How to Make Peppermint Brownies

peppermint brownies sliced overhead on white surface

For a fun holiday twist, you can swap the vanilla in this recipe for 1 teaspoon of peppermint extract instead. When I tested this version, I used only 1/2 cup of cacao powder instead of the 2/3 cup called for in this recipe, and it reminded me of the minty cookies I used to sell as a Girl Scout!

Add a crushed candy cane on top of the brownies before baking, if you want an extra-festive look. It’s not necessary for flavor, but it does add a nice crunch on top.

oat flour peppermint brownies stacked in front of garland
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5 from 6 votes

Oat Flour Brownies

These Oat Flour Brownies taste just as delicious as the traditional version, only these are made with gluten-free oat flour! Be sure to let these brownies cool completely before slicing into them, for the best taste and texture. They are fragile when warm!
Course Dessert
Cuisine American
Keyword oat flour brownies
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 16
Calories 132kcal

Ingredients

Instructions

  • Preheat the oven to 350ºF and lighty grease an 8-inch square pan with oil. Press a piece of parchment paper into the bottom of the pan, so the brownies will be easy to remove later.
  • In a large bowl, combine the oat flour, cacao powder, coconut sugar, baking soda, and salt. Whisk well to combine.
  • Add in the melted butter and stir briefly, to make sure it cools down slightly. Then add in the egg and vanilla extract, and stir again. Fold in the chocolate chips.
  • Transfer the batter to the prepared pan and use a spatula to press the batter into the bottom of the pan. This batter is thicker than you might expect, so it won't spread easily. Bake at 350ºF for 20 to 25 minutes. The middle still might look slightly jiggly in the center, but these brownies will firm up as they cool. If you bake them for 30 minutes, the edges will become quite crispy, which is not my preference, but I mention it in case you like that!
  • Let these brownies cool completely before slicing into them. Oat flour produces a very fragile brownie that will crumble if you cut into them while they are warm. However, once they cool, they will hold together much better, with a fudgy texture in the middle. You can place them in the fridge to speed-up the cooling process, if you like. Leftovers can be stored in an airtight container in the fridge for up to 1 week, or they can be frozen for up to 3 months.

Notes

Nutrition information is for 1 of 16 brownies. This information is automatically calculated, and is just an estimate and not a guarantee.
If you use unsalted butter, you may want to increase the salt in this recipe to 1/4 teaspoon. You can add up to a 1/2 teaspoon of salt, if you prefer a more salted brownie flavor.
If you'd like to attempt a lower-calorie brownie, I've made this recipe using only a 1/3 cup of butter, and the results are also good! They are just slightly drier in texture. You can also experiment with swapping half of the butter for pumpkin puree, if you don't might a slightly more cake-like brownie texture.
For a cake-like brownie, add 1 more egg to this recipe. It will make the brownies less fragile when they are warm, too.
To make a vegan brownie, you can swap the melted butter for a 1/4 cup of melted coconut oil and use a flax egg (1 tablespoon ground flax + 3 tablespoons water) to replace the egg. These really need to cool completely before you slice into them, because they will be very fragile when warm.

Nutrition

Calories: 132kcal | Carbohydrates: 15g | Protein: 2g | Fat: 8g | Saturated Fat: 5g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 1g | Cholesterol: 28mg | Sodium: 127mg | Potassium: 75mg | Fiber: 2g | Sugar: 9g | Vitamin A: 207IU | Vitamin C: 1mg | Calcium: 17mg | Iron: 1mg

If you try these oat flour brownies, please leave a comment and star rating below letting me know how you like them.

Reader Feedback: Which flour would you like me to work with next? Let me know if you have any recipe requests!

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Comments

Brenda

These are great! I used 3/4 cup applesauce instead of oil and used the flax egg. Placed them in a muffin tin with parchment paper cups. 350 for 25. Came out great. Might increase the cook time bc they were still sticking to the paper after completely cooling or try reducing applesauce amount. I also made my own oat flour.

Bridget graver

We love this recipe! We added three drops of peppermint essential oil! Yum! Thank you for all of your wonderful recipes!

Esty

sounds great recipe, wondering how would you freeze avocado? how long is it good in the freezer

Christine

These are excellent! Thank you for such a yummy recipe.

MH

These are delicious! The added peppermint is the perfect addition. I have tasted them both fresh out of the oven (where they crumble a little more like cake) and after they’ve sat (more chewy). Both hit the spot. Served with a cup of coffee – the perfect dessert!

Tracey

I made a pan using 2 flax eggs. Baked for 25 minutes. Delish! Fudgy brownie, structured texture not caky though.

Carmen

I made these with 2 flax eggs and 1/3 cup of coconut oil. They turned out fantastic!

Luisa

These are so good! I used homemade oat flour and subbed the butter for 1/2 cup of apple sauce. I used a little bit of butter to butter the pan instead using parchment paper. They came out perfect. Thank you for another wonderful recipe. Although I don’t have a huge sweet tooth, I grew up having dessert every night, so I always long for something sweet at the end of my meal. Thank you for helping me make that sweet ending a healthy one.

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