Preheat the oven to 350 degrees F and grease 3 5-inch round cake pans with cooking spray.
Add the banana, applesauce, pumpkin, coconut oil, orange zest, vanilla extract to a bowl and combine until (almost) smooth.
In a separate mixing bowl, combine the flour, baking powder, cinnamon and salt.
Add the wet ingredients to the bowl with the dry ingredients and use a spatula to stir until combined. Note the batter will be thick and sticky.
Divide the batter evenly between the 3 pans and S=smooth the tops with a spatula.
Bake about 20 minutes until a toothpick inserted in the center of the cakes comes out clean.
Remove from the oven and place on a wire rack to cool for about 5 minutes. Then remove the cakes from the tins and let cool completely on the wire rack.
Once cakes are completely cool, either frost and serve immediately or wrap individually in plastic wrap and store in the fridge for up to a week or in the freezer for a month.