Preheat oven if your lasagna recipe requires baking; otherwise prepare a clean baking dish and lightly coat the bottom with a thin film of extra-virgin olive oil.
Spread a thin, even layer of tomato sauce across the bottom of the baking dish to prevent sticking.
Place a single layer of lasagna noodles over the sauce.
Top the noodles with half of the ricotta cheese (seasoned with salt and pepper), then add half of your chosen fillings, and spoon more tomato sauce over the layer.
Repeat: add another layer of noodles, the remaining ricotta, the remaining fillings, and more sauce.
Finish with a final layer of noodles, spread the remaining tomato sauce evenly on top, and sprinkle with the shredded mozzarella and Parmesan.
Bake or cook according to your lasagna recipe's instructions until heated through and cheese is melted and bubbly.
