1. Heat oven to 400 F. Prepare manicotti shells as directed
on package. Rinse. Let stand in warm water.
2. Spread ¾ cup sauce in 12 X 8 baking dish. Set aside.
3. Combine spinach, ricotta, egg whites, Parmesan cheese and garlic powder in medium mixing bowl. Drain shells. Stuff each shell with heaping ¼ cup spinach mixture. Arrange stuffed shells over sauce in baking dish.
4. Spoon remaining 1 cup sauce over shells. Cover with foil.
Bake for 15 to 20 min, or until sauce bubbles. Sprinkle with mozzarella.
Bake, uncovered, for 5 to 7 min, or until cheese is melted.