1. Melt margarine and add dry cake mix. Add egg and stir till well mixed. 2. Put approximately 1/2 of mixture on bottom of ungreased 9 x 13 pan. 3. Pat down evenly. 4. Combine peanut butter and marshmallow cream and spread over bottom layer. 5. Crumble remaining cake mixture over the top and bake 20 minutes at 350°. 6. Cool and cut into bars.
