What would sugar cookies be without sugar cookie frosting? That's kind of like asking what a birthday would be like without any cake - it can be done without but it's not nearly as fun - or tasty! This is a standard powdered sugar based frosting that spreads well and, when you feel like getting really fancy, works well with icing bags and tips.
4 cups powdered sugar, sifted
1/3 cup shortening
4 tablespoons soy or rice milk
1 teaspoon vanilla extract
1) In large bowl, combine the sugar and shortening until creamy. Mix in milk and vanilla until combined well.
2) If desired, divide frosting into bowls and add your choice of food coloring for decorating.