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For filled cupcakes: Spoon about 1 cup of the frosting into resealable plastic bag. Cut a small piece off one of the bottom corners of bag. Make an indentation in the center of each cupcake using the handle of a wooden spoon or a straw, making sure not to break through bottom of cupcake. Pipe about 1 teaspoon frosting into each cupcake. Spread top of cupcakes with remaining frosting. Decorate as directed.