Pre-heat your oven to 350º F. Don't forget to either grease your muffin tin, or you can line it with cupcake liners.
In a large bowl, whisk together the flour, sugar, xanthan gum, baking powder, baking soda, salt, and cinnamon.
If you want them, add the raisins to a small bowl and sprinkle with about ½ teaspoon of the flour mixture. This will help keep them from sinking to the bottom.
In a small bowl, whisk together the eggs and oil.
Add the egg mixture to the dry ingredients, and blend just until combined.
Stir in the zucchini and raisins, if using.
Pour the batter into the cupcake liners, one by one, until they're about 2/3 of the way full.
Bake at 350° F for 12-15 minutes, or until a toothpick or cake tester inserted in the middle of a muffin comes out clean.
Remove the muffins from the oven and let cool on a wire rack.
That's it! Lather them with dairy-free or vegan butter and enjoy.