In a blender or food processor, add together the raisins, carrots, milk, lemon juice, oil, honey, eggs and bran cereal. Blend until completely smooth. Pour the batter into a mixing bowl and then add the reamining ingredients. Whisk together the ingredients until all of the flour and oats are combined. Add extra raisins (up to 1 cup) if you would like whole raisins in the muffins. Preheat the oven to 375 degrees. Generously spray 24 muffin tins with cooking spray and pour 1/4-1/3 cup of the batter in each tin. Bake for 18-20 minutes, or until the center comes out clean with a toothpick. Let rest and then eat.