I'm sure everyone has made these before The Original recipe, but here's an easier way and without the mess, made in the microwave. 1/4 cup butter 1 pkg(about 40) regular marshmallows or 5 cups miniature 1/2 tspvanilla extract (optional) 6 cups RICE KRISPIES* cereal In a large microwave safe bowl, heat Butter and marshmallows at HIGH for 3 minutes, stirring after 2 minutes. Stir in vanilla. Stir in KELLOGG'S* RICE KRISPIES* cereal until well coated. Using lightly buttered spatula, press into buttered 3.5 L (13 x 9") pan. Allow mixture to cool slightly. Cut into bars.