1/4 lb. butter (1 stick at room temp.)
6 tbsp. Crisco
1 c. granulated sugar
1 heaping tbsp. cornstarch
3/4 c. lukewarm milk
1 tsp. vanilla

Beat butter and Crisco until creamy. Add sugar, cornstarch and milk gradually until all is used (about 1/4 cup at a time). Add vanilla. Beat on medium speed of hand mixer until all the sugar and milk are added; then beat on high speed about 5 minutes.