Cut off the bottoms of each zucchini and use a cheese grater or box grater to shred into a large bowl. Sprinkle salt on top, toss, and let rest in a colander in the sink for 20 minutes to pull out excess moisture.
Preheat the oven to 375˚F (190˚C).
Using a dish towel, squeeze out excess liquid from the shredded zucchini. Move the zucchini to a dry bowl and add the egg, ricotta bread crumbs, Italian seasoning, basil, parsley, pepper, olive oil, onion, and garlic. Stir until evenly mixed, then form the mixture into golf ball-sized balls.
Bake for 30-40 minutes, or until browned, flipping halfway through.