Cream together butter, sugar, cocoa and vanilla until fluffy; beat in eggs. Sift together flour and salt; stir into creamed mixture. Turn into a greased 15 x 10 inch pan.
Bake at 350 degrees for 25 minutes. Remove from oven. Spread marshmallow creme on bars. Combine peanut butter and chips over low heat until melted; stir in cereal. Spread over marshmallow creme.