In a large pot, boil water and cook noodles until they are bendable but not quite al denté. Rinse with cold water and keep submerged until you use them.

In a small skillet, saute the mushrooms, onion and 1/4 teaspoon salt in the oil until tender; set aside. In a small bowl, combine the pumpkin, half-and-half, sage, pepper, and remaining salt.

Spread ~1/2 cup pumpkin sauce in an 9in x 9in. baking dish coated with cooking spray. Top with three noodles (snip off approx. 2″ of each noodle so they fit in the dish). Spread ~1 cup pumpkin sauce to edges of noodles. Top with half of mushroom mixture, 3/4 cup ricotta, 1/2 cup mozzarella and 1/4 cup Parmesan cheese. Repeat layers. Top with remaining noodles and sauce.

Cover and bake at 190° Celsius for 45 minutes. Uncover; sprinkle with remaining Parmesan cheese. Bake 10-15 minutes longer or until cheese is melted. Let stand for 10-15 minutes before cutting.