Here is the recipe:
10 ounces graham crackers (18 whole crackers, or two cellophane wrapped stacks)
1 stick unsalted butter, melted
1 pinch of salt
1 can sweetened condensed milk
1 1/2 cups semisweet chocolate chips
2 cups mini marshmallows
1. Preheat the oven to 350 degrees. In a large resealable bag (or in a food processor), smash graham crackers until finely ground. Stir in melted butter and salt. Press into a 13×9″ pan.
2. Drizzle can of condensed milk over graham crackers. Sprinkle on chocolate chips; follow with marshmallows.
3. Bake for 30-35 minutes until marshmallows a lightly browned.
From blogger: http://www.sophistimom.com/