Preheat oven at 350. Prepare a loaf pan or muffin tins with cooking and flour. In a strainer set over a bowl, combine zucchini and 1 teaspoon salt and let stand, stirring once or twice, for 30 minutes. With your hands squeeze as much liquid out of the zucchini as possible. In a mixing bowl, stir onions, zucchini, egg white, ketchup, Worcestershire sauce, mustard, garlic, remaining 1 teaspoon salt, pepper, thyme, and oregano. Add meat and bread crumbs and mix thoroughly to blend well. Transfer meat mixture to loaf pan and pack it firmly into a loaf. Smooth top with the back of a spoon. Bake meat loaf for about 1 hour depending on pan size. Let meat loaf rest on a rack for 10 minutes before slicing.