1 c. butter
1 (1 lb.) pkg. brown sugar
2 eggs
2 c. flour
1 tsp. vanilla
1 tsp. baking powder
1 tsp. baking soda

Melt butter. Add brown sugar, eggs, flour, vanilla, baking powder and baking soda. Spread in 15 x 10 inch pan. Sprinkle with 1 cup chocolate chips. Bake 25 minutes at 350 degrees.