1 (10 oz.) pkg. marshmallows
1/4 c. butter
5 c. rice crispy cereal

Place marshmallows and butter in large bowl. Cook on high 5 minutes or until marshmallows are completely melted. Stir until smooth. Add cereal and stir to coat well. Press in greased oblong dish. Cool and cut into squares. May add peanuts or raisins.