Warm Little Chocolate Cakes with Soft Centers

Ingredients

• 1 1/2 cups whole milk
• 3 tablespoons granulated sugar
• 1/2 vanilla bean, split and scraped
• 3 large egg yolks
• 9 ounces bittersweet chocolate, finely chopped
• 6 tablespoons unsalted butter
• 2 tablespoons Cognac or brandy
• 1/3 cup granulated sugar
• 4 large eggs, separated
• 3 tablespoons cake flour