Add all ingredients to a large slow cooker.
8 cups whole milk, ¼ cup pure maple syrup, 2 tbsp packed brown sugar, 3 tsp ground ginger, 1 tsp pure vanilla extract, 2 cinnamon sticks, 1 pinch ground cloves, ½ tsp freshly ground nutmeg, 3½ cups freshly brewed espresso
Cook on low for 3 hours or until heated through. Monitor to make sure it doesn't boil.
Turn slow cooker to warm setting and cook for another 2 hours, stirring occasionally.
Stir again right before serving and taste.
Dip rims of cups in caramel sauce and then in graham cracker crumbs to create the look above (optional). Top with fresh whipped cream and caramel syrup if desired. For extra fun, top with gingerbread cookies.
caramel sauce, graham cracker crumbs, gingerbread cookies, whipped cream