Fill a cocktail shaker about two thirds full with ice. Add bourbon, lemon juice, maple syrup and a pinch of ground cinnamon. Shake vigorously for about 15 seconds until well chilled.
Strain the cold bourbon into a rocks glass filled with fresh ice. Lightly sprinkle a pinch of cinnamon or nutmeg on top. Garnish with a dried lemon slice or a cinnamon stick.