1 C butter- melted
2 C brown sugar- firmly packed
2 eggs
1/4 tsp vanilla
2 tsp baking powder
2 C flour
1 C chocolate chips
Beat butter and brown sugar until smooth.
Add eggs and vanilla and mix until combined.
Add baking powder and flour. Stir in chocolate chips.
Spread batter in greased 9x13 pan.
Bake at 350 for 35 min.