Begin with the least amount called for and increase as needed.
Variations
Browned Butter Frosting: Substitute 1/4 cup melted browned butter for the soft butter.
Butter-Rum: Substitute 1 teaspoon rum flavoring for the vanilla extract.
Caramel Frosting: Substitute 2 to 3 tablespoons caramelized sugar for milk. Thin with more milk if necessary.
Chocolate Frosting: Blend in 1 (1 ounce) square melted unsweetened chocolate.
Coffee Frosting: Substitute warm strong coffee for the milk.
Decorating Frosting: Combine 2 cups sifted confectioners' sugar, 1/2 teaspoon vanilla extract and 2 to 3 tablespoons milk or cream until of decorating consistency.
Fruitcake Glaze: Combine 1/2 cup sugar and 1/4 cup orange juice in small saucepan. Heat, stirring constantly, just until sugar dissolves. Brush over hot fruitcake.
Lemon Frosting: Substitute 1 teaspoon grated lemon rind for vanilla extract and 1 1/2 tablespoons lemon juice for milk. Thin with milk, if necessary. Or substitute 1/4 teaspoon lemon extract for vanilla extract.
Molasses Frosting: Add in 1 tablespoon light molasses with the milk.
Nut Frosting: Blend in 2 tablespoons finely chopped nuts.
Orange Frosting: Substitute 1 teaspoon grated orange rind for vanilla extract and orange juice for milk. Or substitute 1/2 teaspoon orange extract for vanilla extract.
Peanut Frosting: Substitute 2 tablespoons peanut butter for the butter.
Peppermint Frosting: Add in 2 teaspoons crushed peppermint candy and a few drops red or green food coloring. Or substitute 1/4 teaspoon peppermint extract for vanilla extract; add in a few drops red or green food coloring.
Spice Frosting: Add in 1/8 teaspoon cinnamon, 1/16 teaspoon nutmeg and 1/16 teaspoon ground cloves.