Krispie Treats

1/4 cup margarine
1 1-lb. package of mini marshmallows
6 cups Rice Krispie cereal

Melt margarine in large saucepan; add marshmallows and stir until melted. Cook 3 minutes longer; remove from heat. Add krispies and stir well. Press into buttered 13x9x2-inch pan, refrigerate until cool. Cut into bars.