Microwave butter in 4-qt. microwavable bowl on HIGH 45 seconds or until melted. Add marshmallows; toss to coat. Microwave 1 ½ minutes or until marshmallows are completely melted and mixture is well blended, stirring after 45 seconds.
2
Add cereal; mix well.
3
Press firmly into greased foil-lined 13x9-inch pan. Cool. Cut into 24 squares.
