3/4 c. white chocolate, melted over low heat
3 tbsp. flour
1 c. milk
1 c. granulated sugar
1 c. butter
1 1/2 tsp. vanilla

Stir flour into melted chocolate. Add milk, a little at a time, and blend well. Cook over medium heat, stirring constantly, until very thick. Cool completely. In a large mixing bowl, beat sugar, butter and vanilla until light and fluffy. Gradually add cooled chocolate mixture and beat until icing is the consistency of whipped cream.