Total Calories: 446
Yield: 3 dozen bars
Combine melted margarine and dry cake mix. Reserve 1 1/2 cups of this topping for top crust. Pat remaining crumb mixture into ungreased 9x13x2-inch pan. Top that layer with combined peanut butter and marshmallow crème; spread evenly. Crumble remaining mixture over that. Bake 20 minutes at 350°.
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