Oreo Blackout Cake

Ingredients

• Crust
• 27 Oreo cookies, finely crushed
• 5 tablespoons melted butter
• Cake
• 16 Oreo cookies, coarsely crushed
• 2 1/4 cups flour
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1/2 cup butter
• 1 1/3 cups sugar
• 3 eggs, separated
• 2/3 cup sour cream
• 2 1/2 ounces semisweet chocolate, melted
• 1 1/2 teaspoons vanilla
• 1 1/2 cups water
• Filling
• 5 teaspoons butter
• 2 1/2 cups powdered sugar
• 1 teaspoon vanilla
• 1/4 cup milk (approximately)
• Frosting
• 5 tablespoons butter
• 2 1/3 cups powdered sugar
• 1/4 cup good cocoa
• 1 teaspoon vanilla
• 1/4 cup milk (approximately)