Ingredients:
• 2 cups all-purpose flour
• 1 ½ teaspoons baking powder
• ½ teaspoon baking soda
• ½ teaspoon salt
• 1 cup unsalted butter, softened
• 1 ½ cups granulated sugar
• 4 large eggs
• 1 tablespoon vanilla extract
• 1 cup buttermilk
• 1 cup crushed Oreo cookies (for the batter)
• 1 cup crushed Oreo cookies (for the crumble)
For Oreo Buttercream Frosting:
• 1 cup unsalted butter, softened
• 4 cups powdered sugar
• ½ cup cocoa powder
• ½ cup milk
• 1 teaspoon vanilla extract
• 1 cup crushed Oreo cookies (for the frosting)
Directions:
. Preheat the oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
. In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
. In a large bowl, cream together butter and sugar until light and fluffy. Add eggs one at a time, beating well after each addition. Stir in vanilla extract.
. Gradually add the dry ingredients to the wet ingredients, alternating with buttermilk. Mix until just combined.
. Fold in crushed Oreo cookies into the batter.
. Divide the batter evenly between the prepared pans. Sprinkle crushed Oreo cookies on top for the crumble.
. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean. Allow the cakes to cool completely.
. For the Oreo Buttercream Frosting, beat together butter, powdered sugar, cocoa powder, milk, and vanilla extract until smooth and creamy. Fold in crushed Oreo cookies.
. Once the cakes are cooled, frost the top of one cake layer with Oreo Buttercream Frosting, then place the second layer on top and frost the entire cake.
. Optional: Garnish with additional crushed Oreo cookies on top for extra flair.
Enjoy your delightful creation and share the joy! 
