
2 squares (2 ounces) unsweetened baking chocolate
1¼ cups all-purpose flour
3 tablespoons unsweetened cocoa powder
½ teaspoon baking soda
½ teaspoon salt
2 eggs
⅔ cup packed brown sugar
⅓ cup granulated sugar
6 tablespoons cooking oil
1 teaspoon vanilla extract
½ cup water
⅔ cup sour cream