Step 5
In large bowl, beat shortening and 1/2 cup butter with electric mixer on low speed until smooth. Gradually add 4 cups powdered sugar, 1 cup at a time, beating until combined. Add extracts and 2 tablespoons of the milk; beat until blended. Add enough of the remaining 1 to 2 tablespoons milk, 1 teaspoon at a time, beating until frosting is light and fluffy.