Add the crushed ice to a 16-ounce glass, then pour in the ginger ale until the glass is about three-quarters full.
Add the eggnog to fill the remaining space.
Stir in the salted caramel syrup.
Top with a generous swirl of whipped topping. Finish with a dash of cinnamon and festive sprinkles.
Notes
For a crowd, mix ginger ale and eggnog using a 3-to-1 ratio, adding 1 tablespoon of salted caramel syrup per 2 cups of dirty soda. Combine gently in a large pitcher just before serving. Add ice to individual cups and top each drink with whipped topping, cinnamon, and sprinkles for the best presentation.