Oreo cake layers – 1 cup plus 2 tablespoons unsalted butter at room temperature – 1 1/2 cups granulated sugar – 3 cups all-purpose flour – 1/2 teaspoon baking soda – 1 1/4 teaspoons baking powder – 1/2 teaspoon fine grain salt – 5 egg whites – 2 teaspoons vanilla extract – 3/4 cup sour cream at room temperature – 2/3 cup whole milk at room temperature – 15 whole Oreo cookies cream centers removed

Chocolate sprinkles buttercream – 1 1/2 cups unsalted butter – 6 cups confectioners’ sugar – 2 teaspoons vanilla extract – Milk or cream to thin – 2/3 cup real chocolate sprinkles such as DeRuijter Chocolate ganache topping and decor – 1/2 cup semisweet chocolate chips – 1/4 cup heavy cream – 6 whole Oreo cookies

Oreo cake layers – Preheat the oven to 350F. – In the bowl of an electric mixer fitted with the whip attachment, beat the butter until creamy. Sprinkle in the granulated sugar gradually as you mix. Beat until light and fluffy. – In a separate large mixing bowl, sift together the flour, baking soda, baking powder, and salt. – In a 4-cup measure or batter bowl with a pour spout, whisk together the egg whites, vanilla, sour cream, and milk.

– Switch the mixer beater to the paddle attachment Beat 1/3 of the dry ingredients into the creamed butter mixture until just incorporated. Add in half of the liquid mixture; beat until combined. Continue adding 1/3 flour mixture followed by the remaining liquid; end with the flour mixture. Beat until the mixture is lightened in color and fluffy, about 2 minutes. – Coat three 8-inch cake pans with flour-based baking spray. Alternatively, grease and flour 

the pans. Coarsely crush the Oreo cookie shells under your fingers in a large bowl. – Divide the cake batter between the prepared pans. Sprinkle each pan with 1/3 of the cookies; lightly tamp the cookies into the batter using the tip of an offset spatula. Smooth the top of the batter with the flat edge of the offset spatula. – Bake the cakes for 25-30 minutes, or until the cakes spring back when pressed in the centers. Remove the cakes from the oven. If the tops are lumpy