Cook beef and onion in a large skillet over medium high heat; stirring until meat crumbles and is no longer pink; drain.
Combine meat mixture, taco seasoning mix and next 7 ingredients in a 5 1/2 quart slow cooker.l
Cover and cook on low 5 to 6 hours.
Serve with desired toppings (shredded cheese, corn chips and sour cream)
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