Preheat the oven to 350 degrees F. Line a 9-inch loaf pan with parchment paper, and lightly oil the exposed ends of the pan. Spread the zucchini over a few layers of paper towels, cover with a few more layers, and use your palms to press out excess moisture. Set aside while you prepare the batter.
Whisk the almond milk, maple syrup and chia seeds in a medium bowl to combine; set aside for 10 minutes or until liquid has thickened.
Sift the coconut flour, millet flour, oat flour, baking powder, cinnamon and baking soda into another medium bowl. Add the almond meal and whisk to combine; set aside.
Add the eggs, oil, vanilla, vinegar and salt to the chia mixture, and whisk until evenly combined. Set aside about 1/4 cup of the zucchini, and stir the remainder into the chia mixture. Add the flour mixture, and stir with a spatula until evenly combined. Pour the batter into the prepared loaf pan. Spread the remaining zucchini over the top, and sprinkle with chopped almonds.
Bake until a toothpick comes out clean, 1 hour. Let cool for 20 minutes in the pan before turning out.
Choose small, firm zucchini or summer squash for the best flavor and texture. Any color or variety will work well here, but since some are more watery than others, laying the grated zucchini on paper towels and pressing out any excess moisture is a good idea.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.