
½ cup all-purpose flour
2 tablespoons unsweetened cocoa powder
½ teaspoon ground cinnamon
¼ teaspoon baking soda
¼ teaspoon salt
¼ teaspoon ground allspice
1 large egg
⅓ cup packed brown sugar
3 tablespoons granulated sugar
3 tablespoons canola oil
½ teaspoon vanilla extract
1 ounce unsweetened baking chocolate, melted and cooled
¼ cup water
¼ cup sour cream
1 recipe Chocolate Buttercream