Butterscotch Pots de Creme

large egg yolks

unsalted butter ((4 tbsp/57 grams))

muscovado sugar (firmly packed light or dark (1/2 cup/113 grams))

sea salt (fine )

half and half ((2 1/4 cups/540 grams))

vanilla bean paste (or vanilla extract)

Whipped cream (for serving)

Buttermilk Caramel Sauce or other caramel sauce (for serving)

Flaky sea salt, like Maldon (for serving)