Preheat oven to 375°. In a medium sized bowl, mix sugar cookie mix and graham cracker crumbs until combined.
1 17.5 oz bag sugar cookie mix, 1 cup graham cracker crumbs
Pour melted butter over dry mixture. Do NOT follow the instructions on the bag to add any other ingredients.
1 cup melted butter
Evenly press into an ungreased 13×9 inch pan. Bake for 18-20 minutes, until golden brown.
Sprinkle the chocolate chips on top and wait about 3 minutes for them to melt. Spread evenly over the crust.
3 cups semi-sweet chocolate chips
Top with marshmallows and broil for 30 seconds or until golden brown. Watch closely so they don't burn!
4 cups mini marshmallows
Allow to cool for a few minutes and then cut and serve, using a hot knife to make clean cuts.
Notes
To keep from ruining the marshmallow topping, dip your knife in VERY HOT water before drawing through to slice. Wipe off whatever excess sticks to the knife, dip in water again, and slice.