Preheat oven to 375 degrees.
Cream together butter and shortening.
Mix in the brown sugar and granulated sugar.
Add the vanilla and egg.
Mix in the flour, graham cracker crumbs, baking soda and salt.
Stir in mini Hershey’s Kisses, by hand.
Scoop the cookie dough onto cookie sheets, I used a tablespoon dough scoop.
Bake at 375 degrees for six minutes.
Remove from the oven and quickly put a marshmallow on each cookie, pressing down gently to help hold them in place.
Return them to the oven and continue baking the cookies for another two minutes.
Turn on the broiler and toast the marshmallows. Mine took about 90 seconds, but watch them carefully!
Remove from the oven and press a piece of a Hershey’s bar into each toasted marshmallow.