In a large bowl, mix together the zucchini, onion, garlic, eggs, cheese, parsley, milk, and flour. Season with salt and pepper.
Heat about 1 tablespoon of oil in a large frypan over medium heat. Drop tablespoons of the batter into the frypan, and flatten slightly with the back of a spatula. Turn fritters over when the center appears cooked. Cook on the other side until golden brown. Set aside and keep warm. Add more oil to pan as needed, and continue with remaining batter.