Preheat the oven to 350ºF. Grease the muffin tin with non-stick cooking spray or line with 12 paper liners.
In a large mixing bowl, whisk together granulated sugar, light brown sugar, vegetable oil, eggs, and vanilla extract until combined. Stir in the grated carrots and apples.
In another bowl, stir together the flour, baking powder, cinnamon, allspice, nutmeg, and salt. Add the dry ingredients to the wet. Stir together.
Then, gently fold in the walnuts and raisins. Don’t overmix the batter.
Scoop the batter and divide between the prepared muffin tin or paper liners. Bake for 20-24 minutes or until the toothpick inserted in the center of the muffin comes out clean. Start checking for doneness at the 20 minute mark and every 2 minutes after that. Let them cool slightly before transferring to a cooling rack. Enjoy!