Preheat oven to 350 degrees F
Fill muffin pan with liners
In a large bowl, whisk together flour, sugar, baking powder, baking soda, salt and cinnamon until combined, set aside.
In a small bowl, add raisins and sprinkle with about ½ teaspoon of flour mixture. This will help them from sinking to the bottom, set aside.
In a small bowl, whisk together eggs and oil, then, add egg mixture to the dry ingredients and blend just until combined.
Stir in zucchini and raisins, if using and then pour into the muffin pan filling it up about ¾ full.
Bake for 12-15 minutes or until a toothpick inserted in a middle comes out clean
Remove from the oven and cool completely on a wire rack