Preheat oven to 325 degrees. Grease two bread loaf pans (I use small glass loaf pans), and set aside.
In a medium mixing bowl, stir together flour, cinnamon, baking soda, and baking powder, and set aside.
In a separate bowl, mix coconut oil, honey, eggs, and vanilla on low speed with an electric mixer. Add grated zucchini and mix gently.
Add dry ingredients to the wet ingredients and mix until blended. Add nuts if using, and stir well.
Pour into two greased bread pans. Bake at 325 degrees for 1 hour.
Remove pans from the oven and let cool for 10 minutes in the pans. Then remove from pans and cool on a wire rack. After bread has completely cooled, slice and enjoy!