- Preheat the oven to 375°F (190°C) and grease a muffin tin.
- In a large bowl, mix together the flour, sugar, brown sugar, baking powder, baking soda, salt, cinnamon, and nutmeg.
- In another bowl, whisk together the melted butter, eggs, and vanilla extract.
- Combine the wet ingredients with the dry ingredients and mix until just combined.
- Fold in the grated carrots, walnuts, and raisins if using.
- Using a spoon, fill each muffin cup with the batter, about 3/4 full.
- Bake for 20-25 minutes or until a toothpick inserted comes out clean.
- Let cool for a few minutes before transferring to a wire rack.
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