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Fry hamburger. Add onion and cover with lid until onions are transparent.
Grate crumbs. Grease casserole; put 1/2 meat mixture, 1/2 zucchini, with crumbs in first layer. Sprinkle with cheese. Repeat layer. Add tomato sauce. Bake at 350 for 50–55 minutes.
One half, or less, serves 6.