In a large bowl, combine cream cheese and butter. Beat on medium speed with an electric mixer for 30 seconds. Gradually beat in 1 cup of the powdered sugar. Beat in creme de menthe. Gradually beat in remaining powdered sugar. Beat in 1 tablespoon of additional milk, if needed, to make the filling slightly thicker than a frosting.
*Note: Can substitute Creme de Menthe for 2 tablespoons milk, 1/2 teaspoon mint extract, and several drops of green food coloring.
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