1 pkg. (2-layer size) yellow cake mix
1/2 cup butter, melted
3 cups Jet-Puffed Miniature Marshmallows
1 cup candy-coated chocolate pieces
1/2 cup peanuts, chopped
Heat oven to 375F. Combine cake mix, butter and egg; spread onto bottom of 13x9-inch pan sprayed with cooking spray. Bake 16 to 18 min. or until toothpick inserted in centre comes out clean. Top immediately with remaining ingredients. Bake 2 min. or until marshmallows begin to melt. Cool completely before cutting into bars.