In a non-stick pan with oil, brown an onion, a chopped veg sausage and mushrooms. Add salt and pepper to taste.
Turn on the oven at 200°C (400°F) static function
Sprinkle the bottom of a baking dish (25x15 cm) with olive oil to prevent the lasagna from sticking.
Also put 1 tablespoon of béchamel sauce on the bottom of the dish.
Then start making your lasagna in layers in this order : Lasagna sheets - Béchamel sauce - mushrooms and sausage - grated veg cheese - a drizzle of oil. Then start over with the next layer until you reach the end.
On the surface of your lasagna put béchamel sauce, sausage and mushrooms, veg cheese and olive oil in smaller quantities than the layers.
Put at least 200/300ml of water in the corners to prevent it from drying out in the oven.
Bake for 45min/1h. Leave to rest for 5-10min once removed from the oven and serve!