Place zucchini and yellow onion in food processor using the shredding attachment and shred. Place in a couple of paper towels and squeeze out all the excess liquid. You may have to replace the paper towels a few times!
Place zucchini and onion in a bowl. Mix well with almond flour, egg, garlic cloves, garlic powder, salt, and pepper.
Scoop out the mixture and place into 7 muffin cups. Either use silicone muffin liners or be sure to heavily grease each muffin tin to keep it from sticking.