In a mixing bowl, combine heavy cream, whole milk, and sugar. Whisk gently until the sugar fully dissolves and blends well. Add vanilla extract and mix again until the base looks smooth, light and slightly creamy.

Pour the caramel sauce into the mixture and add sea salt. Stir slowly so everything blends evenly. The mixture should turn a soft golden color and smell rich, sweet and slightly buttery.

Transfer the mixture into a freezer-safe container and spread it evenly. Cover it tightly to avoid ice crystals forming. Place it in the freezer for at least eight hours or overnight until it becomes fully solid.

Remove the frozen base from the freezer and place it into the Ninja Creami container. Insert it into the machine and select the ice cream function. Let the machine spin until the texture begins to look creamy.

After the first spin, check the texture carefully. If it looks crumbly or dry, use the re-spin function. This step helps create a smooth and creamy finish. Repeat once more if needed for the best result.

Scoop the ice cream into bowls or cones. Add extra caramel sauce on top if you like a richer taste. Serve immediately while it is soft and creamy, and enjoy the perfect balance of sweet and salty flavors.