1/4 c. butter
1 (10 oz.) pkg. regular marshmallows
1/2 c. peanut butter
4 c. Rice Krispies
1 1/2 c. M&M'S®

Melt butter in large saucepan over low heat. Add marshmallow and peanut butter. Stir until completely melted. Remove form heat. Add Rice Krispies and M&M'S®. Stir until well coated. Using buttered spatula or waxed paper, press mixture evenly into buttered 13x9x2-inch pan. Cut into squares when cool.