INGREDIENTS
•
4 tablespoons plus 1 teaspoon unsalted butter
•
1/4 cup plus 1 teaspoon flour
•
2 tablespoons unsweetened cocoa
•
1 teaspoon baking powder
•
1/2 teaspoon salt
•
3 ounces unsweetened chocolate, broken into 1/2-ounce pieces
•
2 ounces semisweet chocolate, broken into 1/2-ounce pieces
•
3 eggs
•
1 cup sugar
•
1 teaspoon pure vanilla extract
•
1/4 cup sour cream
•
4 ounces chocolate chunks