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

In a large pan, melt butter and brown sugar together. Add eggs and vanilla, then the dry ingredients. Spread into greased 9x13 pan. Sprinkle with about 1 cup chocolate chips. Bake at 350 degrees for 30 minutes.