Recipes for Rainbow Frosting Rainbow Buttercream bastecutfold.com With this versatile buttercream rainbow frosting, you can decorate cupcakes; pipe swirls into whoopie pies, sandwich cookies, or macarons; or fill homemade donuts or cream puffs. submitted by bastecutfold rainbow buttercream rainbow buttercream recipe rainbow cupcakes rainbow frosting rainbow icing Entry Permalink Report Post