Birthday Fun Cup Treats

In large saucepan melt butter over low heat. Add marshmallows and stir until completely melted. Remove from heat. Add KELLOGG'S RICE KRISPIES cereal. Stir until well coated. Divide warm mixture into sixteen 2 1/2-inch muffin-pan cups coated with cooking spray. Shape mixture into individual cups. Cool. Remove from pans. Before serving fill with pudding, ice cream or frozen yogurt. Top with ice cream topping, whipped topping or nuts, if desired. Serve immediately. MICROWAVE DIRECTIONS: In microwave-safe bowl heat butter and marshmallows on HIGH for 3 minutes, stirring after 2 minutes. Stir until smooth. Follow steps 2 thru 4 above. Microwave cooking times may vary. Note: For best results, use fresh marshmallows. 1 jar (7 oz.) marshmallow creme can be substituted for marshmallows. Diet, reduced calorie or tub margarine is not recommended. Store no more than two days at room temperature in airtight container. To freeze cups, place in single layer on wax paper in airtight container. Freeze for up to 6 weeks. Let stand at room temperature for 15 minutes before filling.