1 stick butter
2 c. brown sugar
2 eggs
1 c. flour
2 tsp. baking powder
1 tsp. salt
1 tsp. vanilla
3/4 c. peanut butter

Melt butter over low heat. Remove and stir in sugar. Cool and stir in eggs. Stir in flour, baking powder, and salt. Mix in peanut butter and vanilla. Spread in well greased 11 x 15 inch jelly roll pan and bake 20 to 25 minutes at 350 degrees. Cut while warm.