Coat slow-cooker bowl with
nonstick cooking spray. Place beef
and onion in bottom of slow cooker.
Combine tomatoes and taco
seasoning; pour over beef.
Cover and cook on HIGH for
6 hours or LOW for 8 hours. One hour
before end of cooking time, stir in
beans and corn.
Serve with sour cream, sliced
scallions and tortilla chips, if