If you choose one of the less-cheesy fillings, try topping with 3 cups White Sauce I and 1 cup shredded Parmesan (4 ounces) instead of tomato sauce and mozzarella.
Prepare and have ready:
Preheat the oven to 350°F. Lightly grease a 13 × 9-inch baking dish.
Cook in a large pot of boiling salted water until barely tender:
Drain. Stuff the pasta with the filling and arrange side by side in the prepared baking dish. (At this point, the dish can be covered and refrigerated for up to 24 hours.) Spoon the tomato sauce over the pasta and sprinkle with:
Cover with foil and bake until heated through, about 40 minutes. Let stand 10 minutes before serving.