1 c. flour
1/2 c. butter
1/2 c. brown sugar
2 eggs, beaten
1 tsp. vanilla
1 c. brown sugar
2 tbsp. flour
1 tsp. baking powder
1/2 tsp. salt

Mix first 3 ingredients like pie crust and pat in 9 x 13 inch pan. Bake 5 minutes at 350 degrees. Meanwhile mix remaining ingredients and pour over first mixture when baked. Top with 1 cup chopped walnuts and 1 cup chocolate chips. Bake 15 minutes more at 350 degrees or until firm in middle. Cool and cut into bars.