White Velvet Icing

Directions

1. 1
   Mix flour and sugar and slowly stir in milk.
2. 2
   Stirring constantly, cook over low heat until mixture is very thick and has boiled about 1 minute.
3. 3
   Chill.
4. 4
   Cream butter and gradually add sugar and beat until mixture is very fluffy.
5. 5
   Slowly beat in cooled milk mixture and vanilla.
6. 6
   Spread on cake.