Creating delicious Carrot Cake Zucchini Muffins is simple when you follow these steps:

1. Preheat the Oven: Set your oven to 350°F (175°C) and line a muffin tin with paper liners or grease it lightly.
2. Prepare the Vegetables: In a bowl, grate the zucchini and carrots. If the zucchini is watery, squeeze out excess moisture with a clean kitchen towel.
3. Mix Dry Ingredients: In a large bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg, and salt until well combined.
4. Combine Sugars and Wet Ingredients: In another bowl, mix the granulated sugar, brown sugar, vegetable oil, eggs, and vanilla extract until smooth.
5. Fold in Vegetables: Add the grated zucchini and carrots to the wet ingredients, mixing until just combined.
6. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix to maintain a light texture.
7. Add Nuts and Raisins: If desired, fold in the walnuts or pecans and raisins for added texture and flavor.
8. Scoop into Muffin Tin: Use a scoop or spoon to fill each muffin liner approximately ¾ full with batter.
9. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
10. Cool: Once baked, remove the muffins from the oven and let them cool in the pan for 10 minutes. Then transfer them to a wire rack to cool completely.

These steps guide you to create warm, flavorful muffins that will be a hit for any occasion.