Preheat oven to 350 degrees F. and prepare a muffin pan with muffin cups or spray with a natural nonstick cooking spray.Process shredded coconut and walnuts in a food processor or blender for about 15 seconds.Add dry ingredients (coconut flour, baking soda, salt, cinnamon and baking powder) to the food processor or blender and grind for about 3 seconds. Transfer to a large bowl and set aside.Combine wet ingredients (maple syrup, vanilla, eggs, coconut oil, crushed pineapple, carrot and apple) in medium bowl.Stir wet ingredients into dry ingredients. Don't overmix. Transfer batter into 12 regular-sized muffin cups.Bake muffins for 24-28 minutes at 350 degrees F. and until toothpick comes out clean. Allow muffins to cool for 10 minutes before serving.Leftover muffins can be stored in an airtight container at room temperature for about 2 days. Any more than that and I would store in the fridge. Alternatively, wrap individually in plastic wrap and freeze for up to one month.