Preheat oven to 350°F (175°C). Line muffin tin with paper liners.
In a large bowl, combine flour, sugar, baking soda, cinnamon, and salt.
In another bowl, whisk together eggs, oil, and vanilla extract.
Stir in grated carrots, diced apples, raisins, and chopped nuts.
Add wet ingredients to dry ingredients and stir until just combined.
Divide batter evenly among muffin cups.
Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.
Cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.