Reese's Bars - slightly adapted from food.com
1 1/2 cups graham cracker crumbs
3 cups powdered sugar
1 1/2 cups peanut butter
1 cup margarine, melted
1 12 oz. bag semi-sweet chocolate chips
Line a 9" x 12" baking dish with foil. Spray lightly with cooking spray. Combine graham cracker crumbs, powdered sugar, and peanut butter. Mix well. Blend in melted margarine until well combined.
Press mixture evenly into pan. In a microwave proof bowl, heat chocolate chips at 30 second intervals, stirring in between, until melted. Spread evenly over top of peanut butter mixture.