Heat oven to 375 degrees.

In a large bowl, stir together cookie mix and graham cracker crumbs. Then stir in melted butter to form a soft dough.

Press the dough into an ungreased 13x9 inch pan

Bake for 18 to 20 minutes or until crust is set.

Immediately sprinkle chocolate chips over the crust and let them stand for about 3 to 5 minutes or until the chocolate starts to melt. Spread the chocolate out evenly.

Set your oven to broil and sprinkle the marshmallows over the chocolate.

Place your pan close to the top and heat for 20 or 30 seconds until the marshmallows are toasted.

Cool for 10 minutes, cut into bars and serve warm.