Preheat oven to 350 degrees F.
Whisk together the wet ingredients—chia eggs, maple syrup, olive oil, and milk—in one mixing bowl.
In a second bowl, thoroughly mix together the nutmeg, salt, baking soda, and gluten-free flour (or wheat-based flour if you prefer).
Use a spoon to mix your chopped zucchini into your wet ingredients.
Combine the contents of both bowls and mix them together. It’ll be lumpy. That’s good. If you’re adding mix-ins, add them now.
Spoon your batter into baking cups of your muffin pan or directly into your loaf pan. Although I use a nonstick silicone muffin pan, which is great for preventing messes, I still used baking cups for this recipe. These won’t rise much while baking so you can fill them pretty full.
Bake for approximately 30 minutes for muffins or 60 minutes for bread. Test for doneness with a toothpick. Both the muffins and gluten-free zucchini bread firm up a little while cooling. You can cool the bread in the loaf pan and the muffins on a wire rack.