2/3 c. butter
2 2/3 c. flour
1 1/2 tsp. baking powder
1 tsp. salt
1 box (2 1/3 c.) brown sugar
3 eggs
1 1/2 tsp. vanilla
12 oz. chocolate chips

Melt butter in a large pan. Remove from heat. Sift together dry ingredients. Add brown sugar to butter. Add eggs, one at a time. Add dry ingredients. Add vanilla. Add chocolate chips. Spread on 11 x 16 inch cookie sheet. Bake at 350 degrees for 20 to 25 minutes.