• 2/3 cup minus 1 tablespoon all-purpose flour
• 1 tablespoon cocoa powder
• 5 ounces dark (60–70 percent) chocolate, chopped
• 1/2 cup unsalted butter, cut into slices
• 1 tablespoon strong brewed coffee
• 1/2 cup granulated sugar
• 1/2 cup light brown sugar
• 1 1/2 teaspoons pure vanilla extract