In a large skillet, cook zucchini in 1 tablespoon oil until tender; about 5-6 minutes; drain and set aside.
In the same skillet; sauté the onion and garlic in remaining oil for 1 minute. Add tomatoes, basil, oregano, garlic salt and pepper; simmer, uncovered for 10 minutes. Remove from the heat; gently stir in zucchini.
Place in an ungreased 13-by-9-by-2-inch baking dish. Top with stuffing mix; sprinkle with Parmesan cheese. Cover and bake at 350 degrees for 20 minutes. Uncover and sprinkle with mozzarella cheese. Return to the oven for 10 minutes or until golden.
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