Add 1 (14oz) can sweetened condensed milk and 1 cup semi-sweet chocolate chips to a medium saucepan. Heat over medium heat, stirring constantly, until chocolate chips are melted. This will take 3-5 minutes.
Remove from heat and stir in 2 tablespoons unsalted butter, ⅛ teaspoon sea salt, 1 teaspoon vanilla extract, and 3 tablespoons heavy cream. If needed, add additional heavy cream to thin.
Serve warm or allow to cool for storage.
Notes
Chocolate: I recommend using a good quality brand of chocolate or chocolate chips (such as Ghirardelli), for the richest results. If using a bar of chocolate, be sure to chop into small pieces before melting.Storage: Refrigerate in an airtight container for up to 3 weeks. Rewarm slowly in the microwave, stirring every 30 seconds, until pourable.