01 - Combine whole milk and heavy cream in a medium saucepan over medium heat. Warm until steaming but not boiling, stirring occasionally to prevent scorching.
02 - Add chocolate chips, caramel sauce, and granulated sugar to the warm milk mixture. Whisk continuously until chocolate and caramel are completely dissolved and mixture is silky smooth.
03 - Stir in sea salt and vanilla extract until fully incorporated. Taste the mixture and adjust sweetness or saltiness to your preference.
04 - Pour the hot chocolate evenly into two heat-resistant mugs, leaving about half an inch at the top for toppings.
05 - Top each mug with whipped cream, drizzle generously with additional caramel sauce, and finish with a pinch of flaky sea salt. Serve immediately while hot.