Salted Dark Chocolate and Dulce de Leche Tart

INGREDIENTS

1 1/2 cups

vanilla wafer cookie crumbs (from about 7 ounces cookies)

2 tbsp

light brown sugar

1/8 tsp

fine sea salt

1/4 tsp

ground cinnamon

6 tbsp

unsalted butter, cut into chunks

8 oz

dulce de leche

2 tbsp

heavy cream, as needed

6 oz

good quality dark chocolate (70-75%), finely chopped

1 1/4 cups

heavy whipping cream, divided

1/4 cup

unsalted butter, cut into chunks

1 tsp

vanilla extract

flake sea salt (such as Maldon), for topping