Preheat the oven: Set your oven to 325°F (163°C). Grease a 9” x 5” loaf pan to prevent sticking. If toasting nuts, line a small, rimmed baking sheet with parchment paper.
Toast the nuts (optional): Spread the chopped nuts on the prepared baking sheet. Bake for about 5 minutes, stirring halfway, until fragrant and toasted.
Mix wet ingredients: In a large mixing bowl, whisk together the melted coconut oil and honey until smooth. Add the eggs and whisk again. (If the coconut oil solidifies, warm the mixture slightly to re-melt.)
Incorporate remaining wet ingredients: Whisk in the milk, baking soda, cinnamon, vanilla extract, salt, and nutmeg.
Add zucchini and dry ingredients: Stir in the grated zucchini. Add the flour and mix until just combined—some lumps are fine. If using nuts, gently fold them in.
Pour and decorate: Transfer the batter to the greased loaf pan. Sprinkle a little cinnamon on top and swirl with a knife for a decorative touch.
Bake: Bake for 55 to 60 minutes, until a toothpick inserted in the center comes out clean and the loaf springs back when touched.
Cool and slice: Let the bread cool in the pan on a wire rack. Once cooled, slice with a serrated knife and serve.