12 tbsp. (1½ sticks) unsalted butter, melted
½ c. granulated sugar
¾ c. brown sugar, packed
1 egg + 1 egg yolk
2½ tsp. vanilla extract
1¾ c. all-purpose flour
¼ c. graham cracker crumbs
1 tsp. salt
½ tsp. baking soda
¼ tsp. ground cinnamon
¾ c. semi-sweet chocolate chips, divided
1 c. mini marshmallows, divided
1 graham cracker sheet, broken into chunks
1 milk chocolate Hershey's bar, broken into individual bars
½ dark chocolate Hershey's bar, broken into individual bars
7-9 large marshmallows, cut in half (depending on the size of your skillet)