I have this White Texas Sheet cake recipe and here is the frosting that goes with it:

1/2 c. unsalted butter
4 1/2 c. confectioners' sugar
1/4 c. milk
1/2 t. almond extract
1 c. nuts, optional

Frosting:

Bring butter and milk to a boil. Remove from heat and add to sugar and almond extract. Mix until smooth and fold in nuts or frost cake and sprinkle on nuts