Rim a coffee mug or heat-proof glass with vanilla frosting. Add hot coffee and remaining ingredients; stir. Serve.
(Homemade Cinnamon Syrup Recipe: In a saucepan over low-medium heat, combine equal parts water and brown sugar. Add either a tablespoon of ground cinnamon, or 2-3 cinnamon sticks, and heat until almost boiling, stirring occasionally.)Type of drink Cocktail Recommended glass Irish Coffee Cup