I planned to post a picture, but the bars went over SO well, that they are well.....GONE!
In a large bowl mix:
2 cups brown sugar
1/2 cup butter
2 cups flour
Mix with your hands until this forms fine crumbs. Remove a little over 1 cup for the top.
To the rest of the crumbs, add:
1 tsp baking soda
1 tsp salt
1 tsp vanilla
1 cup milk
Mix this and pour into a greased 9x13 pan. Sprinkle with 1 cup chocolate chips and the reserved crumbs. Bake at 350 degrees for 25 min.