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