French Buttercream Cookies - cooking recipe

Ingredients

1 1/2 c. powdered sugar
1 tsp. baking soda
1 tsp. cream of tartar
1/4 tsp. salt
1 c. softened butter or margarine
1 egg
1 tsp. vanilla
2 1/4 c. all-purpose flour

Preparation

(These make soft cookies.)