Preheat oven to 350 degrees F. In a large bowl, whisk together flours, salt, apple pie spice, cinnamon, baking powder, baking soda and salt.
In the bowl of a stand mixer, combine sugar, eggs, yogurt, egg whites, pumpkin and vanilla.
Blend on low speed until combined, then bump up to medium speed and blend for 1 minute.
Slowly add the flour mixture, while mixer is on low, until all is added and batter is blended.
Fold carrots, apples, dates and nuts into batter and stir until mixed.
Spray 16 muffin liners with a little cooking spray, then divide mixture evenly among cups.
Bake at 350 degrees F for 20-25 minutes, until a toothpick comes out clean.