To serve HOT: In a medium saucepan, heat cider, bourbon and butterscotch schnapps over medium-high heat until the mixture is hot.
Remove mixture from heat and stir in ginger beer and ginger bitters.
Ladle into mugs and serve immediately with whipped cream and butterscotch syrup.
To serve COLD: Chill apple cider, bourbon, butterscotch schnapps and ginger beer before making the cocktail.
In a pitcher, stir together cider, bourbon, butterscotch schnapps, and ginger bitters.
Add the glasses filled with ice. Top with ginger beer. Garnish with whipped cream and butterscotch syrup.