Irish cream frosting:
1/2 cup butter, softened
1/4 teaspoon salt
1/3 cup Irish cream liqueur, such as Bailey's Irish cream
1 tablespoon Irish whiskey, optional
4 cups powdered sugar
beat butter, salt, liqueur, and if desired, whiskey at medium speed with electric mixer until creamy.
Gradually add powdered sugar, beating at low speed until blended. Beat at high speed for two minutes or until creamy.