Preheat the oven: set to 400°F (200°C).
For store bought pasta check package instructions—some require boiling, others will cook directly in the oven. For pasta made for scratch a pre-cooking of a couple of minutes will suffice.
Spread a thin layer of bolognese and béchamel sauces on the bottom of a baking dish.
Add a layer of lasagna sheets.
Top with bolognese, béchamel, and Parmesan cheese.
Repeat layers, ending with sauces and a generous Parmesan sprinkle.
Bake for 20–25 minutes, or until the top is bubbly and golden.
Let cool for 5–10 minutes before slicing and serving.