Creating Zucchini Carrot Oatmeal Muffins is a breeze when you follow these easy steps:

1. Preheat your oven to 350°F (175°C) and line a muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a large bowl, combine rolled oats, flour, baking powder, baking soda, salt, and cinnamon. Stir well to incorporate.
3. Mix Sugars and Wet Ingredients: In another bowl, whisk together granulated sugar, brown sugar, vegetable oil, eggs, and vanilla extract until smooth and creamy.
4. Combine Mixtures: Add the wet mixture to the dry ingredients, stirring until just combined but do not overmix.
5. Add Grated Vegetables: Gently fold in the grated zucchini and carrots. If using, add the chopped nuts at this stage.
6. Fill Muffin Cups: Using a spoon or ice cream scoop, evenly distribute the batter among the muffin cups, filling each about two-thirds full.
7. Bake: Place the muffin tin in the preheated oven and bake for 25-30 minutes. They are done when a toothpick inserted into the center comes out clean.
8. Cool: Remove the muffins from the oven and let them cool in the tin for about 5-10 minutes. Then, transfer them to a wire rack to cool completely.

These steps will help you create incredibly moist and flavorful muffins that everyone will love!