1. In a pitcher, stir together bourbon, apple cider, lemon juice, maple syrup, and bitters until fully combined. Chill.2. To serve, fill rocks glasses with ice, pour 4–5 oz of the batch, and top with 3–4 oz cold ginger beer.3. Garnish with a crisp apple slice and a cinnamon stick. Great for make‑ahead—mix up to 48 hours in advance without the ginger beer.