Chewy, moist, and fudgy! These EASY, one-bowl oat flour brownies are decadent, delicious, and naturally gluten-free!

Looking for the best oat flour brownies recipe? Keep reading! I’m sharing all my tips and tricks for making perfect brownies to please a crowd.

Oat flour brownies cut up in a baking dish


 

Is there anything better than a moist, fudgy brownie?

It’s a simple, classic dessert that honestly never gets old to me. I’m totally satisfied with a brownie all on its own. But if you add a scoop of ice cream or a drizzle of hot fudge and caramel? Now that is a dessert I could happily eat any time, any place.

Brownies are easy to make, great for a crowd, and always hits the sweet spot! So it’s easy to see why this oat flour brownie recipe has become one of my go-to desserts for a game night, movie night, or family dinner.

Yes, these are naturally gluten-free brownies (as long as you use gluten-free oats). But honestly, no one will ever know! My rich, chocolatey oat flour brownies are just as delicious as the real thing.

In fact, they just may become your new favorite brownie recipe!

Table of Contents

Why You’ll Love This Recipe

  • Rich and fudgy
  • Easy to make
  • One-bowl recipe
  • Naturally gluten-free

You also might like these gluten-free brownies or this flourless chocolate torte!

For more naturally gluten-free recipes try these gluten-free chocolate chip cookies, gluten-free banana bread and gluten-free pizza dough.

Ingredients You’ll Need

Here are the simple ingredients you’ll need to make these fudgy brownies:

Oat flour brownie ingredients on a counter top
  • Sugar: I like to use Domino granulated sugar for all of my gluten-free baking. I don’t recommend swapping sugar with liquid sweeteners, like pure maple syrup or honey. This will change the texture of the brownies.
  • Chocolate chips: For extra delicious gluten-free brownies, be sure to use high-quality semi-sweet chocolate chips or chocolate chunks. Guittard is my favorite brand! Add a few extra chocolate chips for an even more fudgy texture.
  • Butter: I like to use salted butter for this recipe, since it has more depth of flavor than unsalted butter. You’ll combine melted butter with the chocolate chips before adding dry ingredients to the brownie batter.
  • Cocoa powder: You can use Dutch process or natural unsweetened cocoa powder for these oat brownies. Dutch process cocoa lends a richer, darker chocolate flavor, whereas the unsweetened, natural cocoa powder gives that classic, well-known brownie taste. Both are delicious!
  • Oat flour: If you want to keep these brownies gluten-free, be sure to use certified gluten-free oat flour.
  • Eggs: Use room temperature large eggs for these fudgy oat flour brownies.
  • Salt: A 1/2 teaspoon of fine sea salt adds depth of flavor to this recipe. Add a bit of flaky sea salt on top before baking, if you’d like!
  • Vanilla: Always use real vanilla extract for the best results!

Check out this full collection of oat flour recipes!

A Note on Gluten-Free Oat Flour

Even though oats are naturally free of gluten, there is a high risk of cross-contaminating with wheat during the manufacturing process. This means that regular oats may contain gluten.

So if you want to make gluten-free oat flour brownies, it’s very important to use certified gluten-free oat flour. This is my favorite brand!

Certified gluten-free oats are safe for people with Celiac disease because they’re made in a separate facility. They’ve also been tested to ensure they contain less than 20 ppm gluten.

So when in doubt, look for the gluten-free label on any oat flour you buy at the grocery store! You can also make homemade oat flour in a food processor or high-speed blender, but you’ll need to buy gluten-free oats to make them.

For more ways to use oat flour, try these recipes for oat flour wafflesoat flour pancakesoat flour banana breadoat flour chocolate chip cookiesoat flour muffins and oat flour banana muffins.

You also might like these articles on how to make oat flour and substitute for oat flour.

How to Make Oat Flour Brownies

  • Preheat the oven to 350F. Grease a 9×9 baking dish with cooking spray or line with parchment paper and set aside. (I like this light metal pan.)
Melted butter and chocolate in a bowl, and sugar whisked into the bowl
  • Cut the butter into tablespoon-sized pieces. Add the butter and 1/2 cup of chocolate chips to a microwave-safe large mixing bowl. Microwave for 30 seconds.  Stir well, microwave for another 15 seconds and then stir well again.  Repeat for 15 seconds until the chocolate and butter are completely melted and well combined.
  • Add the granulated sugar and whisk for 30 seconds.
Egg whisked into the brownie batter, and oat flour and coconut stirred into a bowl
  • Stir in the eggs one at a time, whisking 20 seconds after each addition. Whisk in the vanilla extract and salt.
  • Using a rubber spatula, mix in the cocoa powder and oat flour until fully combined.
Chocolate chips added to the brownie batter in the bowl, and mixed brownie batter
  • Stir in the remaining chocolate chips.
Brownie batter smoothed into a pan, and baked brownies
  • Pour the batter from the large bowl into the prepared pan. Smooth into an even layer. Bake for 30-35 minutes until set and a toothpick inserted into the center of the brownies comes out clean.
  • Cool the brownies for 30 minutes before cutting. Slice and enjoy one of your new favorite dessert recipes!
A stack of oat flour brownies on a counter top

Storage Instructions

Store leftover brownies in an airtight container at room temperature for up to five days.

FAQs

Can you bake with just oat flour?

Yes, you can use oat flour as an alternative to regular all purpose flour. And while you can combine it with gluten-free flours like almond flour or arrowroot flour, you can also use it on its own. This recipe calls for just oat flour.

Is Baking with oat flour healthy?

Yes, oat flour is a healthier alternative to regular white or wheat flour. It has more fiber, protein, and nutrients like calcium and potassium.

Why is oat flour healthier than white flour?

Oat flour is healthier than white flour because its unrefined, and full of dietary fiber, minerals, antioxidants, and vitamins like iron, potassium, magnesium, calcium, and zinc.

Oat flour brownies on a counter top

Expert Tips & Tricks

  • Use a metal baking pan (if possible). A metal pan helps conduct heat better when making gluten-free brownies and baked goods. I love using this light metal 9×9 pan. If all you have is a glass 9×9 pan, that will still work!
  • Add chocolate chips + cocoa powder: Adding both chocolate chips and cocoa powder gives these brownies a more rich, fugdy flavor. The melted chocolate also helps brownies achieve a shiny top. Be sure to use a high-quality chocolate like Guittard!

MORE OAT FLOUR RECIPES

I hope you love this recipe as much as we do! If you try these oat flour brownies, be sure to leave me a comment/rating below. I’d love to hear from you! 

Oat flour brownies cut up in a baking dish
5 from 7 votes

The Best Oat Flour Brownies

Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Servings 12 servings
Chewy, moist, and fudgy! These EASY, one-bowl oat flour brownies are decadent, delicious, and naturally gluten-free!

Ingredients

  • 10 tablespoons salted butter melted, 140 grams
  • ½ cup high-quality chocolate chips 85 grams
  • 1 cup granulated sugar 200 grams
  • 2 large eggs
  • 2 teaspoons vanilla extract
  • 1/2 teaspoon salt
  • 3/4 cup oat flour 90 grams
  • 1/4 cup unsweetened cocoa powder 25 grams
  • 1 cup chocolate chips 170 grams

Instructions 

  • Preheat the oven to 350F. Grease a 9×9 baking dish with cooking spray and set aside. (I like this light metal pan.)
  • Cut the butter into tablespoon-sized pieces. Add the butter and 1/2 cup of chocolate chips to a large microwave-safe bowl. Microwave for 30 seconds. Stir well, microwave for another 15 seconds and then stir well again. Repeat for 15 seconds until the chocolate and butter are completely melted and well-combined.
  • Add the granulated sugar and whisk for 30 seconds. Stir in the eggs one at a time, whisking 20 seconds after each addition. Whisk in the vanilla extract and salt.
  • Using a rubber spatula, mix in the cocoa powder and oat flour until fully combined. Stir in the remaining chocolate chips.
  • Pour the batter into the prepared baking pan. Smooth into an even layer. Bake for 30-35 minutes until set and a toothpick inserted into the center of the brownies comes out clean.
  • Cool the brownies for 30 minutes before cutting. Slice and enjoy!

Notes

RECIPE NOTES
  • Use a metal baking pan (if possible). A metal pan helps conduct heat better when making gluten-free brownies and baked goods. I love using this light metal 9×9 pan. If all you have is a glass 9×9 pan, that will still work!
  • Add chocolate chips + cocoa powder: Adding both chocolate chips and cocoa powder gives these brownies a more rich, fugdy flavor. The melted chocolate also helps brownies achieve a shiny top. Be sure to use a high-quality chocolate like Guittard!
STORAGE: Store leftover brownies in an airtight container at room temperature for up to five days.

Nutrition

Calories: 270kcal | Carbohydrates: 33g | Protein: 3g | Fat: 15g | Saturated Fat: 9g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 0.4g | Cholesterol: 55mg | Sodium: 195mg | Potassium: 69mg | Fiber: 2g | Sugar: 26g | Vitamin A: 365IU | Vitamin C: 0.1mg | Calcium: 31mg | Iron: 1mg

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Hi, I’m Erin!

BS Food Science,

MS Nutrition

I believe you can make amazing, gluten-free food with everyday ingredients that everyone will enjoy. I’m here to share my tried-and-true recipes with you!

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Comments

  1. Pretty good. Very easy to make, and very easy to eat. Fudgy, slightly oaty, and a bit salty. I spread canned vanilla frosting on top to serve, which was a tasty addition. Impossible not to make on a regular basis going forward. Thank you for sharing oat flour recipes.

  2. 5 stars
    So delicious and fudge, plus a healthy dose of fiber. It’s rare to find a recipe that yields a dish that is both delectable and good for your heart, but this one fits the bill!

  3. Hi,
    I do most of your recipes for kids, and they turn out great always. Esp the banana bread and the big sandwich loaf 🙂
    This oats brownie tasted great too. I will definitely be making it again. However, it was a bit too soft, not holding itself firmly. Lots of slices were lost while lifting. And the sides were hardened and slightly brunt while the centre still couldn’t hold great. I wanted to give 5 more min for the centre but I could see and smell the sides hence pulled out. Any suggestions what happened here?

    1. Hi Ammarah! What kind of pan are you using? The problem of the edges burning before the middle is set can happen if you’re using a dark aluminum pan. It could also be an oven temperature problem. You can try turning you oven down 25 degrees and increasing the bake time. I hope this helps!

    1. 5 stars
      I made these because my gluten-free friend was coming over. I just blended oats so I had all the ingredients in my pantry.
      Such a delicious brownie! Aside from the texture, you’d never know it was gf. Will be making these again!

      1. So nice of you to make them for a gluten-free friend! That’s the best compliment when you can’t tell they’re gluten-free!

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