Easy marshmallows layer bars

1 pkg chocolate or yellow cake mix
1/4 c melted margarine
1/4 c water
1 c M&M's
1/2 c chopped peanuts
3 c mini marshmellows

Mix cake mix, marg and water till blended. Pat into greased 9x13. Bake 20-22 min at 375.
Layer marshmallows, candies, and peanuts over crust. Bake 2-3 min or till marshmallows begin to melt
cool and cut into bars