Step 1

Spray a baking tray with cooking spray, then line it with a piece of parchment that extends past the sides. These will be the handles to lift out the dessert.

Step 2

Visually dividing the pan into 8 equal rectangles, shape the chocolate chip cookie dough into a flat, even, rectangular shape that fits the divided section in the top left corner, making sure the edges are as straight and sharp as possible.

Step 3

Shape the m&m cookie dough into a similar rectangle in the section diagonally across from the chocolate chip cookie dough.

Step 4

Break the graham cracker sheets along their seams into pieces that are just as long as the cookie dough rectangles. Press them to form a wall in the bottom left section.

Step 5

Place 2 full graham cracker sheets in bottom of the section.

Step 6

Layer the chocolate evenly on top.

Step 7

Spread the marshmallows across the chocolate.

Step 8

In the section directly to the right of the chocolate chip cookie dough, carefully spread the brownie batter into a similar rectangular shape.

Step 9

Roll two of the pie crusts together with about a 3-inch (8 cm) overlap, then trim it into a rectangle.

Step 10

Preheat oven to 300°F (150°C).

Step 11

On the far right side of the pan, lay the rectangular sheet of pie crust over where the 2 rightmost sections would be. Press the pie crust into the edges of the pan, then trim off any excess that goes beyond the pan.

Step 12

Place a double layer strip of pie crust in the middle, creasing the dough near the bottom into the pie crust that was laid down in order to help it stick and stay up.

Step 13

Seal off the left exposed edge of the pie crust with another double strip of pie crust. You should now have 2 rectangles completely enclosed in pie crust.

Step 14

If the brownie mix has spread a little bit, push it back into its original rectangular shape.

Step 15

Add the apple pie filling to the bottom right square.

Step 16

Add the pumpkin pie filling to the top right square.

Step 17

Immediately spread the banana bread batter into the section between the brownie and the pie crust.

Step 18

Breaking another graham cracker sheet into pieces, form another wall along the bottom of the banana bread rectangle and the right of the m&m cookie dough.

Step 19

Lay down 2 more sheets of graham crackers inside that rectangle to form a base, then evenly spread the cheesecake batter on top.

Step 20

Bake for 1 hour.

Step 21

Cool completely, then slowly and carefully lift the entire dessert out using the parchment paper handles. Immediately transfer to a large cutting board.

Step 22

Make 8 evenly-spaced slices vertically and 4 slices horizontally, creating bars that are have 1, 2, or 4 flavors.

Step 23

Enjoy!