Preheat the oven to 350 degrees.
Mix the dry ingredients together in a medium bowl.
In a separate bowl, mix the wet ingredients.
Add the wet ingredients to the dry mix and stir gently until just moistened.
Fold in the carrots and raisins (if using).
Fill nine paper muffin cups about ¾ of the way full.
Bake for 10-12 minutes, until tops are springy to the touch. As with any muffin, don't overbake or they will be dry!
