Preheat oven to 400 degrees F.
Put a large deep pot of water on the stove, lightly salt, and then turn up the heat. When it's boiling, carefully put the lasagna noodles in the pot. Cook until al dente, drain, then carefully drape the noodles over the edge of the pot. (If you want, you can drizzle the noodles with a little bit of olive oil so they do not stick to the pot).
In a skillet, cook the sweet Italian sausages over medium heat. I use a wooden spoon to break down the meat as it cooks through.
In a large bowl, combine the ricotta, egg, salt, pepper, oregano, and parsley.
In a large baking dish, coat the bottom with some sauce. Cover the sauce with 3-4 noodles (depending on how wide your dish is). Spoon on some ricotta to the noodles. Add some crumbles of sausage and some mushrooms. Sprinkle with mozzarella cheese.
Then cover with a light layer of sauce.
Place down 3-4 more noodles, then repeat with the ricotta, sausage, mushroom, mozzarella, and sauce. Repeat until there are only 3-4 noodles left for the covering of the lasagna. I then spoon sauce over the noodles and apply a generous helping of mozzarella cheese.Spray one side of a large piece of tin foil with non-stick baking spray. Cover the lasagna and bake for 50-60 minutes. Remove the tinfoil and bake for 15 more minutes.
Allow the lasagna to settle and cool forĀ at leastĀ 10 minutes before digging in!