1 tbsp. instant coffee
1/4 c. warm milk
1/2 c. (1 stick) unsalted butter, softened
1 (1 lb.) box 10X (confectioners') sugar

Dissolve instant coffee in milk in small saucepan. Beat butter in medium bowl with electric mixer until fluffy. Beat in 10X sugar alternately with coffee mixture until smooth and spreadable; add a little more milk, if necessary. Spread evenly over top of cake. Makes enough for large sheet cake and 4 cupcakes. Serve with vanilla cake.