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Oatmeal Brownie Bars

Oatmeal Brownie Bars are a delicious mashup of two favorites - oat bars and brownies. - Bake or Break

The pages of BoB are filled with lots and lots of recipes for brownies and bars. But, how about a combination of the two? Who’s with me?

The premise is simple enough. Mix up a buttery oat bar, layer it with brownie batter, and then add a bit more of the oat bar on top. You get the best of both worlds, the chewy, crunchy oat bar along with the rich, chocolate-y brownie. This is a win-win, people!

Oatmeal Brownie Bars are a delicious mashup of two favorites - oat bars and brownies. - Bake or Break

The recipe itself holds no surprises. If you can make brownies and oat bars, then it will all seem quite familiar to you. This is a great case of the sum being greater than its parts. While I love oat bars and brownies, somehow this combination is magical.

These are sure to be a great crowd-pleaser. Perfect for all those upcoming outdoor gatherings!

Find more bar recipes in the Recipe Index.

Oatmeal Brownie Bars

Yield 24 2-inch bars
Prep Time 25 minutes
Cook Time 30 minutes

Oatmeal Brownie Bars are a delicious mashup of oat bars and brownies!

Oatmeal Brownie Bars are a delicious mashup of two favorites - oat bars and brownies. - Bake or Break


For the oat layer:

  • 1 & 1/4 cups all-purpose flour
  • 1 cup rolled oats
  • 1 cup packed light brown sugar
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt*
  • 2/3 cup unsalted butter, cold, cut into 1/2-inch cubes

For the brownie layer:

  • 1/3 cup unsalted butter
  • 3 ounces unsweetened chocolate, coarsely chopped
  • 1 cup all-purpose flour
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon salt
  • 1 & 1/4 cups granulated sugar
  • 2 large eggs
  • 2 tablespoons water
  • 1 teaspoon vanilla extract


To make the oat layer:

  1. Preheat oven to 350°F. Grease a 9"x 13" baking pan.
  2. Combine the flour, oats, brown sugar, baking soda, and salt. Add the butter and cut into the mixture with a pastry blender or a fork until the mixture resembles coarse crumbs.
  3. Reserve 1 & 1/4 cups of the oat mixture.
  4. Press the remaining mixture into the bottom of the prepared pan.
  5. Bake 10 minutes. Set the pan on a wire rack while you prepare the brownie layer.

To make the brownie layer:

  1. Place the butter and chocolate in a microwave-safe bowl. Heat at half power in microwave in 30-second increments until the butter melts and the chocolate melts when stirred. Sitr until smooth. Set aside to cool slightly.
  2. Whisk together the flour, baking powder, and salt. Set aside.
  3. Using an electric mixer on medium speed, combine the sugar, eggs, water, and vanilla until thoroughly mixed. Add the chocolate/butter mixture, and continue beating until combined.
  4. Reduce mixer speed to low. Add the flour mixture and mix until combined.
  5. Spread the brownie batter evenly over partially baked oat layer.
  6. Sprinkle the reserved oat mixture over the top of the brownie layer.
  7. Bake 18 to 20 minutes or until edges are set. Cool completely before cutting into bars.


*If you're a sweet and salty fan, I highly recommend adding more salt to the oat layer. Try 1/2 teaspoon of salt to give these a lovely salty bite.

Show off your baking masterpiece!

Snap a pic, tag @bakeorbreak, and use #bakeorbreak on Instagram. Can't wait to see your creation!

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    9 Comments on “Oatmeal Brownie Bars”

  1. TOTAL win win!!! Love the chewy oatmeal bars and the decadent brownie layer!

  2. This is a brilliant, delicious combo! Pinned!

  3. Chewy? Chocolaty? Yeah, I’m into this.

  4. I’m a huge fan of oats and it looks so good on top of these brownies! Delicious!

  5. This is definitely a best of both worlds situation!

  6. made these last night and froze them with the intention of giving them to some friends later this week. ummm yeah pretty sure they aren’t leaving the house! incredible!!!! and amazing straight from the freezer. I added the extra salt to the crust layer which was definitely a good idea! thanks for the great recipe!

  7. Going to make these now…..

  8. A new favorite! These made it into the family best of book. Thank you for sharing!

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