My easy French Buttercream Frosting 1 Reviews By kakes_by_kim recipe Comments | 1 Favorites | 90 Print This is the best French buttercream frosting I have ever seen! My easy French Buttercream Frosting Ingredients 2/3 cup sugar1/4 cup flour1/4 teaspoon salt3/4 milk*1 cup cold butter1 teaspoon Clear Vanilla Extract Instructions Place sugar, flour and salt in saucepan and mix thoroughly, stir in milk. Cook over medium heat and stir constantly until very thick. Remove from heat and pour into a medium mixing bowl. Cool to room temperature. Add 1/2 cup butter at a time (cut into several pieces) and beat at medium-high speed until smooth. Add vanilla and beat well. Chill icing for a few minutes before decorating. Iced cake must be refrigerated until serving time.