Creamy Kahlua Hard Sauce

1/2 cup softened butter
1 1/2 cups sifted confectioners' sugar
1 egg yolk
3 tablespoons Kahlua

Beat butter in small bowl of mixer until creamy. Gradually beat in confectioners' sugar, adding egg yolk, then Kahlua. Mixture should be smooth, light and very creamy.

Makes 1 1/2 cups. Good on pie, ice cream, etc.