1 c. milk
5 tbsp. flour
1/4 tsp. salt
1/2 lb. butter
1/2 tsp. vanilla
1 c. sugar

Put milk, flour, and salt in a jar and shake until smooth. Place in a saucepan over medium heat. Stir until thick. Remove from heat and let it cool. Cream together butter, vanilla, and sugar. Add to flour mixture. Whip until fluffy.

Note: butter must be at room temperature.