Preheat the oven
Prepare the baking dish
Spread a thin layer of sauce on the bottom of the dish
Add a layer of noodles
Spread a layer of ricotta or other cheese mixture over the noodles
Add a layer of meat or vegetables if using
Sprinkle mozzarella and Parmesan over the layer
Add more sauce over the top
Repeat the layers until the dish is full
Finish with noodles, sauce, and a final layer of cheese
Cover with foil
Bake until heated through
Remove foil and bake until the top is golden and bubbly
Let the lasagna rest before cutting and serving