Preheat oven to 375 degrees F and spray non-stick 12 muffin tin with cooking spray. Set aside.
In a large mixing bowl add eggs, applesauce, maple syrup, oil, vanilla extract, cinnamon, baking powder, baking soda and salt; whisk well to combine.
Add flour and gently mix until combined. Add zucchini and nuts (if using). Stir and do not over mix.
Distribute batter evenly between 12 openings of a tin (I used regular ice cream scoop) and bake for 20 minutes or until a toothpick inserted in the center comes out clean.
Let muffins cool for a few minutes and transfer to a cooling rack to cool off completely.
Video
Notes
Store: Store muffins on a counter covered with linen towel or in a ventilated container for 1-2 days. After I recommend to freeze them.
Freeze: Bake and cool muffins completely. Place in resealable plastic bag, let the air out as you are sealing, and freeze for up to 3 months. Thaw on a counter for a few hours.