Brown gound beef, salt, pepper, and onion until the beef is no longer pink. Drain the grease. Place the beef mixture in a greased 13x9 baking dish. Add the mushrooms and cream of chicken soup on top of beef mixture. Place the frozen tator tots on the top of the mixture. If desired, top with cheddar cheese (or cheese of your choice). Bake at 350 degrees for 1 hour.
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