To make the cinnamon cider, heat the cider and cinnamon sticks in a small saucepan over medium heat until just simmering. Turn off the heat and let the mixture cool completely. You can store the cider in the fridge like this for a few days!
To make the whiskey sour, combine the cider, whiskey, lemon juice and maple syrup in a shaker glass with ice. Shake for 30 seconds then pour over ice and serve. Garnish with apple slices or cinnamon sticks.