Preheat the oven to 350°F (175°C). Grease a 9x5 inch loaf pan with coconut oil.
In a large mixing bowl, whisk together the eggs, melted coconut oil, Erythritol, and vanilla extract.
Add the shredded zucchini to the bowl and mix well.
Add the almond flour, coconut flour, cocoa powder, baking powder, baking soda, and salt to the bowl. Mix until well combined.
Fold in the dark chocolate chips.
Pour the batter into the prepared loaf pan and smooth out the top with a spatula.
Bake for 50-60 minutes until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan for 10-15 minutes, then transfer to a wire rack to cool completely.
Slice and serve. Store in an airtight container in the refrigerator for up to 5 days.