¼ cup vegetable oil, plus more for tin
1 ½ cups raisin bran cereal
¾ cup milk
½ cup whole-wheat flour (spooned and leveled)
½ cup all-purpose flour (spooned and leveled)
2 teaspoons baking powder
½ teaspoon ground cinnamon
¼ teaspoon salt
1 large egg, lightly beaten
¼ cup packed dark-brown sugar