2. 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;
4. Stir reserved soup mixture into mushroom
mixture. Spoon over manicotti; bake, uncovered, at 350 °F for 15 minutes.
5. Sprinkle with cheese, and bake an additional 5