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Sliced chocolate cake with oreo buttercream filling

Rich Double Layer Chocolate Cake with Oreo Buttercream

Learn how to make a rich Oreo double layer chocolate cake with moist chocolate layers, creamy Oreo buttercream, and chocolate drizzle, perfect for birthdays or celebrations!
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Prep Time 30 minutes
Cook Time 35 minutes
Cake Cool Time 4 hours
Total Time 5 hours 5 minutes
Course Dessert
Servings 12 Servings

Ingredients
  

For the Chocolate Cake:

  • 2 cups all-purpose flour
  • ¾ cup cocoa powder
  • 1¾ cups granulated sugar
  • ¼ cup dark brown sugar
  • 2 teaspoons baking powder
  • 1 teaspoon baking soda
  • 1 cup buttermilk room temperature
  • ½ cup vegetable oil
  • 2 large eggs room temperature
  • 1½ teaspoons vanilla extract
  • 1 cup hot water

For the Oreo Buttercream Frosting:

  • 1 cup Oreo crumbs crushed without the cream
  • 1½ cups unsalted butter softened at room temperature
  • 3 cups powdered sugar
  • 2 teaspoons vanilla extract
  • 2 tablespoons heavy whipping cream

For the Chocolate Drizzle:

  • ½ cup chocolate chips
  • 1 teaspoon coconut oil

For Garnish:

  • Whipped cream
  • Whole Oreos

Instructions
 

Preparing the Cake:

  • Preheat your oven to 350°F (175°C). Butter two 9-inch round cake pans and line them with parchment paper.
  • In a large mixing bowl, whisk together the flour, cocoa powder, granulated sugar, brown sugar, baking powder, and baking soda.
  • In a separate bowl, whisk together the buttermilk, vegetable oil, eggs, and vanilla extract.
  • Gradually add the wet ingredients to the dry ingredients, mixing until just combined.
  • Slowly pour in the hot water, stirring carefully to avoid splashes. The batter will be thin – this is normal!
  • Divide the batter evenly between the prepared cake pans.
  • Bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
  • Allow the cakes to cool in the pans for 20 minutes before transferring them to a wire rack. Wrap each cake layer in plastic wrap and refrigerate for at least 2 hours until fully chilled.

Making the Oreo Buttercream Frosting:

  • Before assembling the cake, prepare the frosting.
  • Remove the cream from the Oreos and crush the cookies into fine crumbs using a food processor or a zip-lock bag with a rolling pin.
  • In a stand mixer or with a hand mixer, beat the butter for 2 minutes until light and creamy.
  • Add in the Oreo crumbs and vanilla extract, mixing well.
  • Slowly add 2 cups of powdered sugar and 1 tablespoon of heavy cream. Mix for 30 seconds.
  • Add the remaining powdered sugar and heavy cream, then beat for 4-5 minutes until fluffy and smooth.

Assembling the Cake:

  • Remove the chilled cake layers from the refrigerator and peel off the parchment paper.
  • Spread a small dollop of frosting on a cake board or plate to secure the first layer.
  • Place one cake layer down and spread about 1 cup of Oreo buttercream evenly over the top.
  • Add the second cake layer and apply a crumb coat (a thin layer of frosting) to seal in the crumbs.
  • Refrigerate for 10 minutes to allow the crumb coat to set.
  • Frost the entire cake with the remaining buttercream, smoothing the sides with a spatula or cake scraper.
  • Refrigerate again for 10 minutes before adding the chocolate drizzle.

Making the Chocolate Drizzle:

  • Melt the chocolate chips and coconut oil in a microwave-safe bowl in 20-second increments, stirring in between until smooth.
  • Let the melted chocolate cool slightly (about 2 minutes).
  • Pour the chocolate over the cake, gently spreading it toward the edges to create a dripping effect.
  • Refrigerate for 10 minutes to set the chocolate.

Final Touches:

  • Pipe whipped cream on top of the cake and garnish with whole Oreos.
  • Allow the cake to come to room temperature for 1 hour before serving.
  • Slice and enjoy the most decadent chocolate-Oreo cake ever!

Notes

Pro Tips for the Best Chocolate Cake

  • Use high-quality cocoa powder for the richest chocolate flavor.
  • Sift dry ingredients to prevent lumps and create a smoother batter.
  • Don’t overmix once you add the wet ingredients to avoid a dense cake.
  • Chilling the cake layers before frosting makes assembly easier and prevents crumbs in the buttercream.
  • For extra crunch, add some crushed Oreo pieces between the layers.
Keyword butter cream frosting, cake recipe, chocolate, chocolate cake, easy cake, frosting, oreo
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