In a small bowl, combine tomato sauce, oregano, basil & garlic powder.
In a bowl, combine beef, bread crumbs, egg white, salt, pepper & HALF of the tomato sauce mixture; mix well.
Divide meat in half. On a sheet of wax paper, form 2 rectangles each about 8 X 10-inches. Spread zucchini over half of each rectangle. Divide cheese & sprinkle over zucchini, still covering only half the meat. Fold the meat over so that zucchini & cheese are inside. Pinch edges of meat to seal.
Place layered meat loaves on top of each other then place on a rack in a shallow baking pan. Top with remaining tomato sauce & sprinkle with Parmesan cheese.
Bake uncovered for about 1 1/2 hrs. or until meat is cooked. Allow to stand 5-10 minutes before slicing.