Preheat oven to 350.
1 sleeve (more or less) graham crackers
1 c salted butter
1 c brown sugar
12 oz semi-sweet chocolate chips
Line a cookie sheet with heavy duty foil. Spray the foil with cooking spray. Cover the pan completely with a single layer of graham crackers. Set aside. Combine butter and brown sugar in a saucepan and bring it to a boil over medium high heat, stirring constantly. Boil it for exactly 5 minutes, stirring it constantly. Pour the mixture over the graham crackers as evenly as you can. Bake for 10 minutes. Sprinkle the chocolate chips over the top. Give the chips a minute or two to melt and then spread them out as evenly as you can. Cool and then chill completely. Peel the foil off and break into random-sized pieces.