To make one cocktail:
In a cocktail shaker, combine apple cider and Mulling Spices. Stir to combine. Add ice and bourbon. Shake until well chilled. Strain into an ice-filled old fashioned glass. Top with ginger ale.
To make a large batch (can be easily doubled, too):
Combine apple cider and Mulling Spices. Mix well to combine. In a punch bowl or large pitcher, combine spiced apple cider and bourbon. Stir well, and then add ginger ale. Serve in small ice-filled cocktail or punch glasses.