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HEAT oven to 425ºF.
SCOOP out seeds and flesh from centers of zucchini halves; discard. Place shells on foil-covered rimmed baking sheet.
MIX turkey, stuffing mix, Parmesan, egg and ketchup. Press into zucchini shells; top with spaghetti sauce and mozzarella.
BAKE 25 min. or until filling is done (165ºF).