Add heavy cream, brown sugar, and salt. Stir well.
Bring to a gentle simmer and allow to cook for 4 minutes, until thickened, stirring occasionally.
Remove from heat and mix in vanilla. Transfer to a mason jar with a lid for storage.
Stir coffee, 1 tablespoon of the caramel, sugar, and cream together. Taste and add more sugar if needed.
Top with whipped cream and another drizzle of caramel if desired.
Drink and enjoy that $4.50 you just saved yourself.
This makes enough caramel for about 4 drinks. You can store the extra in a mason jar in the fridge for up to 2 weeks. To use, microwave for a couple of seconds to soften it and serve over ice cream, in another coffee, or use for dipping apples!