1 onion, chopped

1 (16 ounce) can chili beans

1 (15 ounce) can black beans

1 (15 ounce) can whole kernel corn, drained

1 (8 ounce) can tomato sauce

1 (12 fluid ounce) can or bottle beer

2 (10 ounce) cans diced tomatoes with green chilies, undrained

1 (1.25 ounce) package taco seasoning

3 whole skinless, boneless chicken breasts

shredded Cheddar cheese (optional)

sour cream (optional)

crushed tortilla chips