★★★★★

Oreo Brownie Cake

Oreo Brownie Cake is a decadent treat with three layers! Starting with a brownie base and topped with two layers of white cake, this cake is covered with Oreo frosting and chocolate ganache!

Love decadent cakes? This Salted Caramel Chocolate Cheesecake Cake is to die for. As is this delicious Watergate Cake.

Oreo Brownie Cake with three layers. One layer of brownie, two white cake and topped with oreo frosting and ganache.

Why this Recipe Works

Today’s Oreo Brownie Cake is the ultimate dessert. Whether you need a chocolate treat for Valentine’s Day, a birthday, or just a regular Thursday evening, THIS cake is the answer.

  • Rich brownie base
  • Packed with Oreos
  • Three decadent layers
  • Topped with cookies ‘n’ cream frosting!

The appearance of this brownie cake is nothing short of magical. And it tastes even better. If you love chocolate and Oreo cookies, you need an Oreo Brownie Layer Cake in your life.

Slice of cake with a brownie bottom, white cake, oreo frosting, and chocolate ganache.

Ingredient Notes

Brownie mix – I recommend the Ghirardelli Triple Fudge Brownies for a no-hassle brownie layer that perfectly rich and chocolatey.

Double stuffed Oreos – These are pressed into the brownie layer before baking. You’ll need additional Oreos for blending into the frosting too.

Cake flour – This flour has less protein than all-purpose and gives the cake layer a softer crumb.

Egg whites – Along with cake flour, separated egg whites make the white cake soft and fluffy, but sturdy enough to hold up to the frosting in this recipe.

Ghirardelli dark chocolate morsels – I love the deep cocoa flavor of higher quality chocolate here. The morsels are melted with heavy cream to create an easy chocolate ganache topping.

The Layers

The secret to the BEST Oreo Brownie Cake is in the layers.

1.Oreo brownies: You’ll follow the instructions on the box, but bake the brownies in a round spring form pan instead. Don’t forget to press Oreo cookies into the brownie batter before baking!

2. White cake: Two homemade white cake layers go on top of the brownies.

3. Oreo frosting: The frosting is blended with Oreo cookie crumbs, then spread over each layer of this brownie cake.

4. Chocolate ganache: A silky ganache gives this Oreo Brownie Cake the perfect finishing touch of decadence.

5. Garnish: I like to sprinkle more cookie crumbs over the ganache, then garnish the cake with one whole Oreo cookie on top.

Tips and Tricks

  • Don’t waste your yolks! Separate out the egg whites, then use the yolks to make Lemon Curd or an Apple Slab Pie.
  • Let the layers cool completely before assembling. If they’re warm, they will make the frosting runny.
  • Store this Oreo Brownie Cake covered at room temperature. It’s best enjoyed within 3 days.

Recipe FAQ

Can I use my own brownie recipe instead?

You sure can! This easy brownie recipe (sans frosting) would be perfect too.

I don’t have a spring form pan. Can I still make this brownie layer cake?

Yes, you can use a regular round cake pan (8 or 9 inch) instead. Line the bottom with a circle of greased parchment paper. The circle of parchment should be large enough that the sides hang over the edges of the pan.

Once the brownie layer is baked, let it cool for a few minutes in the pan. Then use the sides of the parchment to life the whole layer out of the cake pan in one piece.

What other kinds of Oreos can I use?

We love the extra cream filling in the double stuffed Oreos, but regular Oreos are good too! Peanut butter Oreos, peppermint Oreos and double chocolate Oreos are other great ways to change up the flavor of the cake.

Can I make the cake layers from a boxed mix?

Yes, your favorite white cake mix should work just fine. Follow the instructions on the box for baking two 9 inch round layers. Then assemble the Oreo Brownie Cake as directed.

Oreo brownie bottom cake with two layers of white cake topped with ganache and frosting.

More Cake Recipes

Yield: 16 servings

Oreo Brownie Cake

Prep Time 30 minutes
Cook Time 1 hour
Total Time 1 hour 30 minutes

Oreo Brownie Cake is a decadent treat with three layers! Starting with a brownie base and topped with two layers of white cake, this cake is covered with Oreo frosting and chocolate ganache!

Ingredients

For the brownies:

For the Cake:

  • 5 egg whites, room temperature
  • ¾ cup milk, divided
  • ¾ cup unsalted butter, softened
  • 1 ¾ cup granulated sugar
  • 1 teaspoon vanilla extract
  • 2 ½ cups cake flour
  • 1 Tablespoon baking powder
  • ½ teaspoon kosher salt

For the frosting:

  • 1 ½ cups unsalted butter, softened
  • 4 cups powdered sugar
  • ¼ cup milk
  • 15 Double Stuff Oreos, divided

For the ganache:

  • 10 ounce Ghirardelli dark chocolate morsels
  • 6 Tablespoons heavy cream

Instructions

For the brownie layer:

  1. Prepare brownie mix in a 9-inch springform pan, lined with parchment paper and sprayed with baking spray. Bake according to package directions. Remove from oven.
  2. Cool 5 minutes in pan, then remove springform and cool on wire rack. Set aside.

For the cake layers:

  1. Whisk together the egg whites and ¼ cup of the milk in a small bowl until slightly combined. Set aside.
  2. In a mixing bowl, beat butter, sugar, and vanilla for 2 minutes on medium speed, scraping down the sides of the bowl as needed. Add in dry ingredients and mix until combined. Beat in egg white mixture until fully blended. Add in remaining milk and beat for 3-4 minutes, scraping down the sides of the bowl.
  3. Spray two 9-inch cake pans with baking spray. Pour batter into pans and bake in a 350 degree oven for 26-28 minutes. Remove and cool completely on wire rack.

For the frosting:

  1. In a food processor, pulse the Oreo until they become a fine crumb. Set aside.
  2. Beat butter in a large mixing bowl for about 4 minutes, until fluffy and pale in color. Add in powdered sugar and milk and beat an additional 3-5 minutes, until fluffy and smooth. Fold in 1 cup of the cookie crumbs (set aside the remaining crumbs for the garnish).

To assemble:

  1. Place the brownie layer on the bottom of a cake platter. Add ¼ of the frosting and spread evenly. Top with one of the cake layers and repeat with another ¼ of the frosting. Top with remaining cake layer and use the last ½ of the frosting to cover the cake completely.
  2. In a microwave safe bowl, combine the dark chocolate with the heavy cream. Heat over high for one minute. Remove and stir until smooth. Allow too cool for a couple minutes, then spread over the top of the frosted cake.
  3. Immediately add the reserved cookie crumbs to the top of the ganache. Add whole Oreos if desired, for a garnish. Allow ganache to set, then serve and enjoy!

Notes

  • Don't waste your yolks! Separate out the egg whites, then use the yolks to make Lemon Curd or an Apple Slab Pie.
  • Let the layers cool completely before assembling. If they're warm, they will make the frosting runny.
  • Store this Oreo Brownie Cake covered at room temperature. It's best enjoyed within 3 days.
  • Nutrition Information:

    Yield:

    16

    Serving Size:

    1

    Amount Per Serving: Calories: 735Total Fat: 39gSaturated Fat: 22gTrans Fat: 0gUnsaturated Fat: 11gCholesterol: 78mgSodium: 247mgCarbohydrates: 94gFiber: 2gSugar: 67gProtein: 5g

    *Nutrition facts are an estimate and not guaranteed to be accurate. Please see a registered dietitian for special diet advice.

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    Can’t decide between Oreos, brownies or chocolate cake? Have them all with this layered Oreo Brownie Cake recipe!

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    About Aimee

    Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

    Learn more about Aimee.

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    Posted on February 1, 2018

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