Disappearing Cake
["1/4 c. butter", "1/4 c. shortening", "2 c. sugar", "2 eggs", "3/4 c. Hershey's cocoa", "1 3/4 c. sifted all-purpose flour", "3/4 tsp. baking powder", "3/4 tsp. baking soda", "1/8 tsp. salt", "1 3/4 c. milk"]
["Preheat oven to 350\u00b0.", "Grease and flour 2 (9-inch) round cake pans."]
["butter", "shortening", "sugar", "eggs", "cocoa", "flour", "baking powder", "baking soda", "salt", "milk"]