4 c. popped corn
3 c. Rice Krispies
2 c. M&M'S®

Combine in a large lightly greased bowl; reserve.

1 c. sugar
1 c. light corn syrup
3/4 c. peanut butter
1/4 c. butter

Melt together over low heat. Bring to a boil over medium heat and boil 2 minutes, stirring constantly. Pour over reserved mixture and toss until thoroughly coat. Spoon and press into a 15 1/2 x 10 1/2 inch pan. Cool about an hour and cut into bars.