Preheat oven to 350 degrees.
Grease a 13 x 9 inch pan and line with graham crackers.
Melt butter in saucepan, then add brown sugar.
Stir until melted and then boil for 2 minutes.
Pour over crackers and bake for 10 minutes.
Remove from oven and immediately place chocolate chips on top.
Spread with spatula when melted.