Salted Dulce de Leche Brownies

Ingredients

• 6oz unsweetened or dark chocolate
• 3/4 cup unsalted butter
• 1/3 cup unprocessed Dutch cocoa powder (unsweetened), sifted
• 3 large eggs
• 1 + 1/4 cup brown sugar, packed
• 1 tsp vanilla extract
• 1 cup all purpose flour
• 1/4 tsp kosher salt
• 1 cup dulce de leche (homemade or store bought)
• Flaky salt, for topping, to taste