2/3 c. shortening
1 pkg. brown sugar (16 oz.)
4 eggs
2 3/4 c. flour
2 1/2 tsp. baking powder
1/8 tsp. salt, optional
1 pkg. (12 oz.) chocolate chips
1 tsp. vanilla

Mix shortening and brown sugar. Add all other ingredients. Spread in pan 10 x 13 inches. Bake 20 minutes at 350 degrees. Cut into bars.