Start by preheating the oven to 350 F and spraying a loaf pan with cooking spray. Line the pan with parchment paper (leaving some hanging on the sides).
Mix the dry ingredients (flour, baking powder, baking soda, salt, cinnamon, and nutmeg) in a large bowl.
Whisk the wet ingredients (eggs, sugar, applesauce, vegetable oil, orange zest, orange juice, and vanilla extract) together in a separate bowl.
Pour the combined wet ingredients into the bowl with the dry ingredients. Mix until no lumps remain.
Fold in the grated zucchini and raisins.
Pour the batter into the loaf pan, smooth it out with a spatula and bake it for one hour or until a toothpick inserted in the middle comes out clean.
Prepare the orange glaze while the cake is baking. In a small bowl, whisk together the powdered sugar, orange juice, and orange zest until the sugar is completely dissolved.
Remove the cake from the oven, let it cool slightly (10 mins), remove it from the pan pulling on the sides of the parchment paper, remove the paper and pour the glaze over the warm bread.
Let cool to room temperature and enjoy!