in a mixing bowl, cream butter and sugar. add eggs and vanilla; beat until fluffy. combine flour, baking powder, salt and cocoa; add to cream mixture. stir in nuts, if desired. spread in a greased jelly roll pan. bake at 350 degrees for 15-18 minutes. sprinkle marshmallows evenly over cake; return to oven for 2-3 minutes. using a knife dipped in water, spread melted marshmallows evenly over the cake. cool. for topping, combine chocolate chips, butter and peanut butter in a small saucepan. cook over low heat, stirring occasionally, until melted and well blended. remove from heat; stir in cereal. spread over bars. chill. |