Pre-heat over to 375. Boil your water and place noodles in the boiling water. Cook noodles according to package or until done.
Sauté the meat with half of the oil for approximately 5-8 minutes ensuring that it is not overcooked, then place the meat into a bowl.
Slice the mushrooms to your desired thickness, if not pre-sliced. Sauté the mushrooms, in the remaining amount of oil, for approximately 5 minutes.
Mix the tomato paste with the meat that was placed in a separate bowl.
In a ceramic rectangular dish, approximately 16 x 9 x 4, place three lasagna noodles and half of the meat mixture. Place the treeline cheese and add another layer of noodles.
Add another layer of noodles, mushrooms, half of the tomato sauce and mozzarella cheese. Layer the last three noodles, the rest of the meat paste mixture, the remaining tomato sauce and the mozzarella cheese, then wrap with aluminum foil.
Place in the oven for 25 minutes. Remove the foil and bake for another 10 minutes.