Mississippi Mud Cake Ingredients 1 cup butter, melted 1 3/4 cups sugar 1/2 cup unsweetened cocoa 4 large eggs, lightly beaten 1 tsp. vanilla extract 1 1/2 cups flour 1 1/2 cups coarsely chopped pecans, toasted 1 (10.5 oz.) bag miniature marshmallows Chocolate Frosting: 16 oz. package powdered sugar 1/2 cup milk 1/4 cup butter, softened 1/3 cup unsweetened cocoa 1/2 tsp. vanilla Preparation Whisk together melted butter and next four ingredients in a large bowl. Stir in flour and chopped pecans. Pour batter into a greased and cocoa dusted 15 x 10-inch jelly roll pan. Bake at 350 for 20 to 25 minutes or until tests done. Remove from oven; top cake evenly with marshmallows. Return to oven, and bake 5 minutes. Prepare Chocolate Frosting: Beat all ingredients at medium speed with an electric mixer until smooth. Drizzle Chocolate Frosting over warm cake. Cool completely.