These are from Betty Crocker. They have a sugar cookie/graham cracker crust with a layer of fudge and toasted marshmallows on top.
Crust – 1 pkg sugar cookie mix, 1 cup of graham cracker crumbs, 1 stick of butter (melted).
Combine and press in ungreased 8×8 pan. Bake 350 in a preheated oven for 18 to 23 minutes. Let cool.
Fudge layer – 2 cups of chocolate chips, 14 oz condensed milk.
Microwave in 45 second intervals until you can stir it smooth. Place on top of crust. Chill 1 hour.
Sprinkle with mini marshmallows.
Broil on high for one minute.
Let stand 1 hour. Cut with a knife that has been run under hot water and wiped off. That makes it easier to cut. (You will have to do the water thing a few times)