1/4 c. butter, melted
1 c. brown sugar
1 egg
3/4 c. sifted flour
1 tsp. baking powder
1/2 tsp. salt
1/2 tsp. vanilla

Preheat oven to 350 degrees. Grease 8" square pan. Stir brown sugar into melted butter, allow to cool. Stir in egg. Blend in flour, baking powder, salt. Stir in vanilla. Pour mixture into greased pan. Bake for 25 minutes, or until a toothpick comes clean.