1 package Betty Crocker sugar cookie mix
1 cup graham cracker crumbs
1 cup butter, melted
2 large Hershey's chocolate bars, broken into small rectangles
4 1/2 cups miniature marshmallows
Preheat oven to 375 degrees. Spray 9 x 13 inch pan with cooking spray. In large bowl mix together cookie mix, graham cracker crumbs and melted butter. Spread into prepared pan. Bake for 18-20 minutes. Turn oven OFF. Immediately after removing from oven place Hershey bar pieces all over crust. Set in oven for 2 minutes. Remove and use a knife to spread the chocolate evenly over the crust. Sprinkle marshmallows over chocolate- covering completely. Turn oven on to broil. Place pan in oven and watch carefully- removing bars as soon as marshmallows start to brown. Best served warm!