Preheat oven to 350 degrees.
In a medium-sized mixing bowl, add dry ingredients. Flour, baking powder, baking soda, salt, and dried onion. Set aside.
Shred zucchini into a second medium-sized mixing bowl. And drain thoroughly.
Add egg, milk, melted butter, and cheese to the zucchini and mix.
Add the dry ingredients to the wet ingredients and mix.
Spray muffin tin with cooking spray.
Scoop even amounts of muffin mix into each muffin tin
Bake in the oven for 25 minutes.
Remove from oven. use a butter knife to pop each muffin out of the muffin tin.
Serve