Ingredients :
°2 tablespoons unsalted butter, plus more, at room temperature, for brushing
°1 1/4 cup sugar
°1 can (5 ounces) evaporated milk
°1/4 teaspoon kosher salt
°1 1/4 cup mini marshmallows
°9 ounces bittersweet chocolate, chopped (1 3/4 cups)
°1 tsp pure vanilla extract