In a small saucepan, add milk and all of the spices (everything but the bourbon and chocolate). Bring to gentle boil over low heat (this will allow the spices to infuse the milk). Once the milk is starting to boil and becomes fragrant, carefully add the chocolate. Whisk until combined and frothy. Line up four mugs and pour 2 tablespoons of bourbon in each. Top each mug off with hot chocolate and enjoy immediately!