Mary,

This is all I came across in my search. Not sure if it is what you are looking for.

AMARETTO BUTTER FROSTING

2/3 C. butter, softened
6 C. sifted confectioners' sugar
1/4 C. Amaretto
1 to 2 T. milk
1 tsp. vanilla extract

Cream butter. Gradually add confectioners' sugar, beating until smooth. Add Amaretto and milk, beating until mixture reaches spreading consistency. Stir in vanilla extract. Makes 3 cups.