Place grated zucchini and onion in a colander. Add ½ Tablespoon salt, mix and let drain for 15-20 minutes. Squeeze out extra liquid with hands.
In a large bowl, add 2 beaten eggs, cheddar and feta, 1 cup bread crumbs, mint, parsley, and ground pepper. Add zucchini/onion mixture. Mix ingredients with a fork. Continue adding breadcrumbs until fritters can be formed with your hands.
Beat 2 eggs in a small bowl.
In another bowl, add 1 cup breadcrumbs.
Heat 1 cup of olive oil in a frying pan. Be careful not to overheat oil.
Form fritters with mixture, dip in or brush with egg and then bread crumbs.