In a small saucepan, combine 2 cups of whole milk and ½ cup of heavy cream. Heat over medium-low until small bubbles form around the edges, but do not let it boil.
Stir in 1 tablespoon of sugar, sea salt and 1 teaspoon of vanilla extract, whisking gently to combine and dissolve the sugar.
Add 6 oz of chopped dark chocolate (70%) to the hot milk mixture. Let it sit for 30 seconds to soften, then whisk until completely melted and smooth.
Continue to cook on low heat for 3-5 minutes, whisking constantly. The mixture should thicken to a velvety consistency that coats the back of a spoon.
Pour the hot chocolate into mugs and top with whipped cream or chocolate shavings if desired. Serve immediately and enjoy!
