3 c. flour
2 1/2 tsp. baking powder
1/2 tsp. salt
2 1/4 c. dark brown sugar
2/3 c. melted butter
4 eggs, beaten
1 lg. (12 oz.) pkg. chocolate chips
2 tsp. vanilla

Sift together flour, baking powder and salt and set aside. Add sugar to melted butter, creaming well. Add eggs to the above, cream well. Add flour mixture, then bits, then vanilla, creaming well after each addition. Spread into a 9x13 inch greased pan. Bake at 350 degrees for 45 minutes.