Spoon remaining 1 cup sauce over shells, but don’t cover completely. Sprinkle mozzarella over each shell. Bake 15 minutes and then switch to broil setting, and broil 3 minutes until cheese is bubbly ...
2. Spread 1 cup of the sauce in a 13 x 9 x 2-inch shallow baking dish. Place the filled shells on the sauce. Pour the remaining sauce over the shells. Sprinkle with the remaining mozzarella cheese.