Mix Ingredients: Combine cooled brewed coffee, heavy cream, whole milk, sugar, and vanilla extract in a bowl until sugar dissolves.
Freeze: Pour mixture into a freezer-safe container. Freeze for 24 hours until solid.
Churn: Transfer frozen mixture to Ninja Creami. Follow machine instructions to churn until creamy.
Add Mix-Ins (Optional) and Serve: Add chocolate chips or caramel swirls during last minutes of churning if desired. Scoop into bowls and enjoy immediately!
