Rice Krispie Treats, Chocolate-Peanut Butter

1/4 c. butter or margarine
2 large spoonfuls peanut butter
1 bag mini marshmallows
6 c. rice krispies
12 oz. chocolate chips
2 T. margarine

In a large pot, melt together the 1/4 c. margarine, peanut butter, and marshmallows. Remove from heat. Stir in rice krispies. Spread and press out in 15 1/2 x 10 1/2 x 1 buttered jelly roll pan. Melt chocolate chips and 2 T. margarine together in microwave and spread over HALF of the rice krispie mixture. Cut down center and flip the other half over the chocolate covered half.