Free Recipes at rubyglen.com Fruity Pebbles Cupcakes yields 2 dozen 1/2 stick butter  1 pkg. mini-marshmallows  1 pkg. Fruity or Cocoa Pebbles (13 oz.)(8 1/2 cups)  1 can vanilla frosting Microwave butter in a 4 qt. container for 45 seconds. Add marshmallows and microwave for 1 1/2 minutes. Stir. Add cereal. Mix. Press into greased muffin pans to form cupcakes. Cool. Remove from pans and spread with frosting.