1/4 c. butter
1 (10 1/2 oz.) bag mini marshmallows
6 c. Rice Krispies

Melt butter in microwave (about 45 seconds). Add marshmallows; toss to coat. Microwave 45 seconds. Stir and microwave about 45 seconds more. Immediately add cereal and toss until well coated. Press into 9x13 inch buttered pan. Cool and cut into squares.