Chop the onion and place it in the bottom of your crock potLayer the chicken breast on top of the onion and sprinkle the taco seasoning on top of them.Add the canned ingredients on top of the chicken and seasoning {beans, rotel, corn and tomato paste}Pour your beer or chicken broth over the top of the mixtureCover and set your crock pot to cook on low for 7 hours.Use a fork or tongs to shred the chicken and mix the chili to evenly distribute.Cook one additional hour.Serve hot with toppings of your choice!Topping suggestions: sharp cheddar cheese, sour cream, cilantro, avocado, tortilla chips