Boil noodles in water with oil until soft. Drain and set aside to cool. Brown meat and strain off grease. Mix together in large bowl: meat, ricotta cheese, optional mushrooms, optional clam chowder, egg and season to taste. Using a spoon, stuff noodles with meat and cheese mixture. Stuff noodles with as much as they will hold. Using a long baking pan with 2-inch sides, spread a layer of sauce in bottom of pan. Then lay stuffed noodles on top of sauce, followed by another layer of sauce on top of noodles. Sprinkle with grated cheese. Cover dish and bake for 20 minutes in 350° oven.