Chocolate Soufflés

Name: Chocolate Soufflés
Ingredients: 1 to 2 tablespoons unsalted butter, softened; 2 to 3 tablespoons granulated sugar; 2 tablespoons unsalted butter (); 1 tablespoon all-purpose flour; 1 tablespoon cocoa powder; 1/2 cup whole milk; 2 tablespoons liqueur (such as orange or coffee liqueur), rum, or bourbon (optional; see note); 1 teaspoon vanilla extract; 1/4 teaspoon salt; 4 oz bittersweet chocolate, chopped; 3 large eggs, separated; 1/3 cup granulated sugar; Confectioners’ sugar (optional, for dusting)