Place the dulce de leche in a small saucepan and warm over low heat until melted. Add the butter and stir until incorporated.
Remove from the heat and add the chopped chocolate. Stir until the chocolate is melted then add the vanilla, sea salt and milk. Add additional milk if needed for proper consistency.
Cool slightly before serving, refrigerate leftovers.
Notes
Nutrition information is calculated using an ingredient database and should be considered an estimate. When multiple ingredient alternatives are given, the first listed is calculated for nutrition. Garnishes and optional ingredients are not included.