Vanilla Butter Frosting (Betty Crocker)

Fills and frosts two 8- or 9” layers or frosts a 13x9” cake. (Doubled Recipe)
$2.05 with 3% tax

2/3 c soft butter or margarine
6 c powdered sugar (1# 9.6oz)
3 tsp vanilla
About 4 Tbsp milk 

Blend butter and sugar. Stir in vanilla and milk; beat until frosting is smooth and of spreading consistency.