32 Manicotti shells
42 oz can creamy chicken mushroom
2 cup commercial sour cream
8 cup chopped cooked chicken
1 cup chopped onion
8 tbsp butter or margarine
16 oz can sliced mushrooms undrained
4 cup shredded Cheddar cheese

Cook manicotti shells according to package directions, omitting salt; drain shells, and set aside.Combine soup and sour cream; stir well.
Combine half of soup mixture and chicken; stir well. Set aside remaining soup mixture.
Stuff manicotti shells with chicken mixture; place in a greased 12- x 8-x 2-inch baking dish.saute onion in butter in a large skillet until tender; add mushrooms.
Stir reserved soup mixture into mushroom mixture. Spoon over manicotti; bake, uncovered, at 350 °F for 15 minutes.
Sprinkle with cheese, and bake an additional 5 minutes.