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Place chicken in the slow cooker. Sprinkle chopped onion over top and dollop cream of chicken soup over top. Allow to cook on low for 7 hours or high for 3 hours.
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About 30 minutes before serving, cook the rice according to package instructions.
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Remove chicken from slow cooker and shred; return to slow cooker.
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Once rice is cooked, stir it into the chicken mixture in the slow cooker. Stir in shredded cheese and corn. Continue cooking just until cheese is melted.