In a mixing bowl, cream margarine and sugar; add eggs. Stir in cocoa, flour, vanilla and salt. Spread into a greased 9x13 baking pan. Bake at 350° for 20 to 25 minutes or until brownies test done. Cool. Spread marshmallow creme over cooled brownies. Melt peanut butter and chocolate chips; stir in rice cereal. Spread over marshmallow layer. Chill before cutting. Store in refrigerator. Yields 3 dozen.