Layer half of the beef, mushrooms and onion in 3 1/2 to 4-quart slow cooker; repeat layers.
Pour soup over ingredients in slow cooker.
Cover; cook on low setting for 8 to 10 hours or until beef is tender and no longer pink.
Before serving, toss stuffing mix and contents of seasoning packet with melted butter and 1/2 cup liquid from pot.
Place stuffing on top of contents in slow cooker; cover.
Increase heat to high setting.
Cook 10 minutes or until stuffing is fluffy.
Sprinkle with cheese; cover.
Cook until cheese is melted.
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