Bakery Shop Icing

Directions

1. 1
   In a large bowl, cream butter, shortening, sugar and vanilla together.
2. 2
   Stir cornstarch into milk and add to butter mixture.
3. 3
   Beat at low speed until well blended.
4. 4
   Beat another 5 to 7 minutes until icing is creamy.
5. 5
   Note: This icing will appear curdled at first, but continue beating and it will become smooth.