After you bake the rolled up shells and noodles in the sauce, covered for 40 minutes at 375, you take out the dish, remove the foil and pour the remaining 1/2 cup of parmesan over the tomato sauce. As you can see, the cheese started melting right away. Pop it back in the oven on broil for 4-6 minutes until the top is spotty brown. We didn't wait that long or put it on broil since the house was hot already and it's just not worth the high price of gas.