Preheat oven to 350. Spray 12-cup muffin pan with cooking spray.
In large bowl, combine flour, sugar, baking soda, cinnamon and salt. Make a well in the center of the mixture.
In separate bowl, whisk together pineapple, pumpkin, eggs and vanilla. Add to flour mixture, stirring until moistened. Fold in carrots, walnuts and raisins.
Spoon batter into muffin pan, evenly distribute it between 12 muffins. Bake for 22-25 min until toothpick comes out clean. Remove from oven. Cool in pan for 10 min.
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