Cream shortening and sugar. Add ... with milk and vanilla. Drop by tablespoon on ... one half of pie with filling below and double. ... well. Spread on whoopie pies. Pies stay fresher if wrapped in waxed paper.
Mix all ingredients together. Drop ... slightly granular). Add vanilla. Mix. Add in flour/milk ... onto bottom of whoopie pie (about 1/4 inch thick). Top with another whoopie pie (sandwich-style).