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

Combine flour, brown sugar, peanut butter, and butter; blend at low speed until crumbly; reserve 1 cup for topping. Add baking powder, soda, milk, vanilla and eggs to remaining crumb mixture; blend at low speed until moistened, beat 3 minutes at medium speed. Pour batter into greased and floured 9x13 inch pan. Sprinkle with reserved crumbs and 1 cup chocolate chips. Bake at 350 degrees for 50 minutes.