Sift and mix:

2 c. flour
1 tsp. baking powder
1/4 tsp. baking soda
1 tsp. salt

Melt 2/3 cup butter, add 2 eggs and 2 cups brown sugar. Mix, then add butter mixture to flour mixture. Mix, spread in 13 x 9 inch cake pan then sprinkle 1 cup chocolate chips on top. Bake in 350 degree oven for 25 minutes.