1/4 c. butter
1 (10 oz.) pkg. (about 40) regular marshmallows or 4 c. mini marshmallows
5 c. Rice Krispies cereal

Melt butter in large pan over low heat. Add marshmallows and stir until melted. Remove from heat. Add Rice Krispies cereal; stir until well coated. Using buttered spatula or waxed paper, press mixture evenly into buttered 13x9x2-inch pan. Cut into squares when cool.