1 (18 1/4 ounce) package yellow cake mix or 1 (18 1/4 ounce) package chocolate cake mix
12 cup margarine or 12 cup butter, melted
1 large egg
3 cups mini marshmallows
1 cup miniature M&M baking bits
12 cup chopped peanuts
Mix cake mix, margarine, or butter and egg until combined. Spread into lightly greased 13x9x2-inch pan. Bake at 375 for 16-20 minutes until toothpick inserted comes out clean. Immediately sprinkle marshmallows, m&m's, and peanuts over crust. Bake for 2-3 minutes more until marshmallows begin to melt. Cool completely and cut into bars.