Brown hamburger and onion; drain. Add spaghetti sauce, italian seasoning, and garlic powder just to blend. Trim ends off zucchini and slice in half length wise. Lay side by side in baking dish. Pour spaghetti sauce over and cover top of it with cheese. Cover with foil. Bake at 350 degrees until squash is tender about 30 to 45 minutes. Sprinkle with parmesan cheese.
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