HEAT oven to 400°F. Mix cottage cheese, spinach, 1/2 cup mozzarella, Parmesan and seasoning until well blended; spoon 1 heaping Tbsp. into each pasta shell.
COMBINE pasta sauce and tomatoes; spoon 1/2 into 13x9-inch baking dish. Place shells, filled-sides up, in baking dish; top with remaining sauce mixture. Cover with foil.
BAKE 25 min. or until heated through. Uncover; top with remaining mozzarella. Bake, uncovered, 2 min. or until cheese is melted.