Begin by shredding the zucchini and adding the apple sauce, melted butter, and eggs. Whisk together, and also whisk in any sugar or sweetener if you are using.
Once wet ingredients are combined, top with flour, baking powder, baking soda, and spices. Then the mix dry ingredients on top before incorporating them into the wet ingredients.
Mix together ingredients until just combined and no dry flour remains. Stir in walnuts.
Scoop batter into 12-15 greased or lined muffin tins. I like to use a large ice-cream scoop to make this easier.
Bake in a 375° F oven for 15-18 minutes or until toothpick comes out clean.
Enjoy served warm topped with butter.