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.Using buttered spatula or wax paper, evenly press mixture into 13- x 9- x 2-inch pan coated with cooking spray. Cool. Cut into 2-inch squares. Best if served the same day.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 and 3 above. Microwave cooking times may vary.NoteFor 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, place in layers separated by wax paper in airtight container. Freeze for up to 6 weeks. Let stand at room temperature for 15 minutes before serving.Kellogg's® has reduced the sodium content of Rice Krispie® to meet current consumer flavor- and nutrition-preferences. Rice Krispies Treats made with the lower sodium cereal taste great without any added salt, but, if you desire, add 1/4 teaspoon salt to the butter before melting. Continue with recipe as directed.This recipe has been tested and endorsed by Kellogg's® Rice Krispies®Go to http://www.ricekrispies.com for more recipes and nutrition information.®, ™, © 2008 Kellogg NA Co