2/3 c. chunky peanut butter
1/4 c. butter
1 c. packed brown sugar
2/3 c. sugar
1 tsp. vanilla
3 eggs
1 1/2 c. flour
3/4 tsp. baking powder
1/4 tsp. baking soda
2 c. chocolate chips

Mix together flour, baking powder, and baking soda; set aside. Blend peanut butter and butter until creamy. Add sugar, brown sugar, vanilla, and eggs. Mix well. Stir in flour mixture and chocolate chips. Put in greased 13 x 9 x 2 inch cake pan. Bake at 350 degrees for 30 to 35 minutes.