Heat oven to 325 degrees Fahrenheit. Line 12 regular size muffin cups with paper or cupcake liners.
In a small bowl, whisk together the flaxseed with water and let it sit for 5 minutes.
Sift the flour, baking powder, baking soda, salt and pumpkin spice mix into a medium bowl. Whisk until blended.
Peel the banana and using a fork, mash it well.
Combine pumpkin puree, mashed banana and apple sauce. Whisk it few times so everything is well combined.
Combine the dry ingredients, wet ingredients and flaxseed water mix together. Make sure it's a smooth paste without lumps.
Fill each muffin cup ¾ full – the batter should be just enough for 12 cupcakes. Sprinkle some raisins on the top.
Bake cupcakes at 350 degree Fahrenheit in the middle rack of the oven until a toothpick or cake tester comes out clean when inserted into the middle of a muffin, 20 to 25 minutes.
Cool the muffins on the rack for some time. Then enjoy your beautiful creation !