Melt margarine in large saucepan over low heat. Add marshmallows and stir until completely melted. Remove from heat.
Add KELLOGG'S® RICE KRISPIES® cereal. Stir until well coated.
Using buttered spatula or waxed paper, press mixture evenly in 15 1/2- x 10 1/2- x 1-inch pan coated with cooking spray. Using 4-inch snowman cookie cutter, cut into snowman shapes when cooled. If snowman cookie cutter is not available, use 1 1/2-inch, 1 3/4-inch and 2-inch round cookie cutters. Using frosting, connect each circle to make snowman and decorate as desired with remaining ingredients. Best if served the same day.
MICROWAVE DIRECTIONS: In a large microwave safe bowl, heat margarine and marshmallows at HIGH for 3 minutes, stirring after 2 minutes. Stir until smooth. Follow steps 2 and 3 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 in airtight container.