Step 1

Preheat the oven to 350 degrees.

Step 2

Beat the butter and both sugars. Mix in the egg and vanilla. Mix in the flour, baking powder, and salt. Stir in the graham cracker crumbs.

Step 3

Line an 8×8 baking dish with parchment and press 1/2 of the dough into the bottom of the pan. Lift out the parchment with the dough on it and set it aside – this will be your top cookie layer.

Step 4

Line again with parchment and press the remaining dough into the bottom of the pan. Layer with the chocolate bars, peanut butter, marshmallow creme, and top cookie layer.

Step 5

Bake for 30 minutes or until golden brown on top. Let cool completely for best serving results.