These S'more Chocolate Chip Cookies are made of a chewy brown-sugar base laced with melty chocolate, stuffed with gooey marshmallow, and topped with crispy graham cracker bits. -½ cup unsalted butter, softened -1 cup light brown sugar (tightly packed) -1 large egg -2 teaspoons vanilla extract -1 ¾ cup all-purpose flour -¼ teaspoon salt -½ teaspoon baking soda -¾ cup chocolate chips (I used dark) -2 graham crackers -10 full-sized marshmallows