03Preheat the oven to 350 degrees. Oil a large baking dish or two 2-quart dishes. The shells should fit into the dish in one layer. Fill each shell with a scant tablespoon of the filling. Arrange in a single layer in the baking dish. Top with the tomato sauce and cover the dish with foil.
04Bake 30 minutes in the preheated oven. Remove from the heat, sprinkle on the remaining Parmesan, and serve.