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In medium bowl, combine pureed zucchini, egg product, margarine, parsley, salt, pepper and 6 tablespoons of the Parmesan cheese; blend well. Stir in diced zucchini and onion. Add baking mix; mix well. Pour into sprayed baking dish. Sprinkle with remaining 2 tablespoons Parmesan cheese. Spray cheese with nonstick cooking spray to lightly coat top.