Shoo-Fly Cupcakes
["2 1/2 c. unsifted flour", "1/2 c. soft butter", "1 1/2 c. brown sugar (not packed)", "1 tsp. baking powder"]
["Mix together flour, butter, brown sugar and baking powder. Save 1/2 cup crumbs for top."]
["flour", "butter", "brown sugar", "baking powder"]