Fudgy Oat Flour Brownies (Gluten-Free)

Name: Fudgy Oat Flour Brownies
Prep time: 7 min
Cook time: 28 min
Ingredients: 100 grams oat flour (approximately 1 cup scooped and leveled); 1 cup coconut sugar; 3/4 cup unsalted butter (melted); 3/4 cup chocolate chips (divided); 1/2 cup cocoa powder; 3 large eggs; 2 tablespoons avocado oil; 1 tablespoon tapioca starch; 2 teaspoons vanilla; 1/2 teaspoon salt

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Oat flour brownies have a rich flavor, extra fudgy texture, and are made with simple ingredients. They’re easy to mix in one bowl and are always a family-favorite!

Closeup view of sliced oat flour brownies with chocolate chips on top.

Quick Look at the Recipe

🍽️ Flavor: Rich and chocolatey
⏱️ Prep Time: 7 minutes
🔥 Cook Time: 28 minutes
🕒 Ready In: 1 hour and 5 minutes (including resting time)
👥 Servings: 16 servings
🥣 Main Ingredients: Oat flour, coconut sugar, butter, eggs, cocoa powder, chocolate chips
📋 Method: Bake at 350
📖 Dietary Info: Gluten-free
❄️ Freezer Friendly: Yes!
👩‍🍳 Tip: These brownies call for both butter and avocado oil which gives them a rich, buttery flavor plus all the fudgy-ness that comes from using oil.

Woman smiling while standing in a sunny room.

The Brownies You’ve Been Waiting For

Brownies have always been one of my favorite desserts, right up there with homemade ice cream! So when it came to creating an oat flour brownie recipe, it brought out all of my perfectionist tendencies.

I wanted brownies that were extra fudgy but still held together well, packed with rich flavor, super easy to make, and of course, used only my favorite healthier ingredients.

After months of testing (which my family did not mind one bit), I’m so excited to finally share these oat flour brownies with you! They have the classic brownie flavor and fudgy texture and come together in just one bowl. I hope you love them as much as I do!

Ingredients

Oat flour – I prefer to grind oat flour myself, but you can also purchase it. For gluten-free brownies, make sure to use certified gluten-free oat flour.
Coconut sugar – My favorite sweetener I use in almost all of my naturally-sweet desserts! White sugar will also work.
Butter – For a classic, rich brownie flavor. I use store-bought or homemade unsalted butter, but if you prefer to use salted, reduce the salt in this recipe by 50%.
Eggs
Cocoa powder
Chocolate chips – I used semi-sweet, but you can use dark or milk chocolate depending on your flavor preference.
Tapioca starch – If you prefer, you can substitute cornstarch.

Step-By-Step Instructions

Mixing bowl with dry ingredients with a whisk in it on a wood table.

Step 1: First, in a large mixing bowl, whisk together the dry ingredients: oat flour, cocoa powder, tapioca starch, and salt.

Brownie batter in a mixing bowl on a wood table.

Step 2: Then gently stir in the coconut sugar, melted butter, eggs, avocado oil, and vanilla until just combined. Fold in 1/2 cup of the chocolate chips.

Cover and place in the fridge to rest for 30 minutes.

Oat flour brownie batter in a glass baking dish lined with parchment paper on a table.

Step 3: Preheat oven to 350 degrees and line an 8″x8″ glass baking dish with parchment paper.

Evenly spread the brownie batter into the pan and sprinkle the remaining chocolate chips on top.

Baked oat flour brownies in a glass pan on a table.

Step 4: Finally, bake for 25-30 minutes or until it’s mostly set but not yet completely firm to the center.

Let cool completely before removing from the pan and slicing. Enjoy!

Sliced brownies on parchment paper and stacked on a plate.

If you’re looking for more oat flour desserts, check out my oatmeal chocolate chip cookies and gluten-free chocolate cupcakes!

Tips for the Best Oat Flour Brownies

Weigh the oat flour – The amount of oat flour in a standard cup measurement can vary significantly, so I recommend weighing it for best results. If you don’t have a kitchen scales, you can gently scoop the flour into a cup with a spoon and use a knife to level off the top.

Stir the batter gently – To avoid the brownies rising and then collapsing, the batter should have as little air mixed in as possible.

Don’t rush the resting time – Allowing the batter to rest for 30 minutes gives the oat flour time to soak up additional moisture and creates a smoother texture.

Don’t over-bake – For the best fudgy texture, when you pull the brownies out of the oven, they should still look slightly gooey in the center. They’ll firm up as they cool.

In my tests, 28 minutes is the perfect amount of baking time, but this can vary from oven to oven. I prefer airing on the side of under-baking rather than over-baking.

Cool completely before slicing – Since these are gluten-free, they tend to break apart easier if they’re sliced while still warm.

Hand holding oat flour brownie so you can see fudgy texture.

FAQs

Can I freeze brownies?

Yes! Oat flour brownies freeze wonderfully. I recommend cooling and slicing them and then freezing between layers of parchment paper.

How long do oat flour brownies keep?

You can store oat flour brownies in an airtight container at room temperature for 3-4 days. I think they’re best on the second day!

How do I serve brownies?

These brownies are delicious by themselves, but for an extra-special treat, top with homemade whipped cream or healthy vanilla ice cream.

Do these brownies have a crackly top?

No, these brownies are topped with chocolate chips instead.

Brownies with the best crackly tops call for refined sugar and include additional steps. I created this recipe with coconut sugar, and I wanted to simplify the steps so it could be mixed in one bowl.

Why did my brownies sink in the center?

It’s normal for homemade brownies to sink slightly, but significant sinking is due to too much air being whipped into the batter. To prevent this, gently stir the wet ingredients into the batter with a spatula until everything is just combined. Make sure to never whisk or beat it!

Why are my brownies too cakey?

This is usually caused by using too much flour and/or mixing the batter too long. To ensure the correct amount of flour, I recommend weighing it. When stirring the batter, gently stir until it’s just combined.

If you try this recipe, snap a photo and tag me on Instagram @violet_rightathome