Line a 9 x 13 inch baking dish with foil. Spray bottom of foil lined pan with cooking spray.

Pour half of the brownie batter into the pan and spread evenly to cover the pan.

Next, layer the graham sheets on the batter. Break or cut sheets if needed to cover the batter.

Lay the 3 chocolate bars over the graham layer.

Remove the lids and paper layer off the containers of marshmallow fluff. Place each in the microwave for 10 seconds. (This makes it easier to work with.)

Spread marshmallow fluff over the chocolate bars.

Pour remaining brownie batter over the marshmallow fluff. and gently spread over the marshmallow layer.

Bake at 350 degrees for 25-30 minutes, until edges are crisp and center is set. You can test the bottom layer using a toothpick. Just make sure it is brownie and not melted chocolate on the toothpick. Makes 15 brownies.