Melt 2/3 cup butter
Pour over to melt
2 ¼ cup brown sugar
Add 3 eggs, one at a time
Sift
2 ¾ cups flour
2 ½ tsp baking powder
½ tsp salt
Stir into batter.
Add 12 oz chocolate chips
Will be very thick batter. Smooth out into jelly roll pan (15x10)
Bake at 350° for 20 minutes. Bars are done when just barely browning.
From Jane Metler, MLRE.org