Mississippi Mud Pie Ingredients Crust: 16 ounces whole (cream included) chocolate sandwich cookies (35-40 cookies) such as Oreos, crushed 5 tablespoons unsalted butter, melted Flourless Chocolate Cake: 4 tablespoons (1/2 stick) unsalted butter 6 ounces good-quality dark chocolate (60-70%), chopped 2 tablespoons plus 1 teaspoon instant espresso powder 1/4 cup strong coffee, at room