Do not drain any of the cans. Open them up and dump all of them into a large soup pot.
Add the taco seasoning and some salt and pepper, to taste. Stir everything together.
Bring to a boil, then reduce the heat to a gentle bubble and simmer for about 15 minutes.
Taste and adjust seasoning, if needed.
Ladle into bowls and top with shredded cheese, a dollop of sour cream, a few avocado cubes, and crushed up tortilla chips.