Preheat oven to 350 degrees. Grease a 9x5x3 inch loaf pan with coconut oil or butter.
Separate 4 eggs into two bowls. Whip the egg whites until very fluffy. In the other bowl, blend together the 4 egg yolks, zucchini, oil, coconut milk, sweetener, vanilla, cinnamon, and salt. Then add the other 2 eggs (or 4 if not using coconut milk), one at a time, beating well after each addition.
Combine coconut flour and baking powder and sift into batter. Blend until there are no lumps. Fold in nuts. Gently fold in the egg whites to the batter.
Pour into a greased pan. Top with unsweetened coconut flakes and bake for 60 minutes or until an inserted toothpick comes out clean. Cool and enjoy!