Preheat oven to 400 °F (200 °C). Lightly spray muffin pan
In large bowl, combine flour, cereal, raisins, carrots, sugar, cinnamon, baking powder and baking soda. In separate bowl, stir together soured milk or buttermilk, oil, egg and lemon rind; pour over dry ingredients and stir just until moistened
Spoon into prepared pan. Bake for about 20 minutes or until tops are firm to the touch