Chocolate Wafers
["2 1/2 c. all-purpose flour plus more for work surface", "1/2 c. cocoa powder", "2 1/2 tsp. baking powder", "1/4 tsp. salt", "1 1/2 sticks unsalted butter, softened", "1 1/2 tsp. vanilla extract", "1 1/2 c. sugar", "2 large eggs", "1 Tbsp. milk"]
["In a medium bowl, sift together the flour, cocoa, baking powder and salt; set aside. In the bowl of an electric mixer, cream butter, vanilla and sugar; add eggs and milk. Mix until thoroughly blended. Add reserved flour mixture, scraping sides of the bowl. Divide the dough in half and shape into a flat disk. Wrap each disk in plastic wrap, then chill until firm."]
["flour", "cocoa powder", "baking powder", "salt", "butter", "vanilla extract", "sugar", "eggs", "milk"]