1/4 c. butter
1 (10 oz.) pkg. reg. marshmallows or 4 c. miniature marshmallows
6 c. Rice Krispies

Microwave butter and marshmallows on high in large glass mixing bowl for 2 minutes. Stir to combine. Microwave on high 1 1/2 to 2 minutes longer. Stir until smooth. Add cereal, stir until well coated. Using wax paper, press mixture evenly into buttered 13"x9" pan. Cut into squares when cool.