Beat butter, corn syrup, vanilla and salt in a large mixing bowl until light and fluffy. Gradually beat in powdered sugar and 2 tablespoons milk. Add additional milk, 1 teaspoon at a time as needed, to reach desired spreading consistency. Add food coloring, if desired.
Recipe will frost 24 cupcakes OR a 2-layer cake (8 or 9-inch) OR a 13 x 9-inch cake.