From the Taste of Home Baking Classics Cookbook. This frosting is perfect with chocolate cake.
1 pkg (3 oz) cream cheese, softened
1/4 cup creamy peanut butter
2 cups confectioners' sugar
2 Tbs milk
1/2 tsp vanilla extract
Beat the cream cheese and peanut butter in a bowl until smooth. Beat in the sugar, milk and vanilla. Spread over cake. Store in the refrigerator.
Enough frosting to cover the top of a 9x13 cake. I usually double the recipe.