1. In a medium bowl, combine the graham cracker crumbs and the melted butter. Press mixture into a 9×13 pan.
2. Pour the sweetened condensed milk over the graham cracker bottom.
3. Sprinkle on both kinds of chocolate chips and the Reese’s.
4. Bake at 350 for 25 minutes.
5. Place marshmallows on top in an even layer.
6. Broil for 2-3 minutes to brown the marshmallows – be sure to not overcook.
7. Refrigerate at least 30 minutes prior to serving.