Add all ingredients to a slow cooker. Stir well. Cook on low 8 hours or on high 6 hours. Serve topped with shredded cheese, sour cream, and diced avocado, if desired.
To Freeze
Add all ingredients to a large freezer bag. Mash to mix. Label and freeze.
To Cook After Freezing
Add frozen meal to slow cooker. Cook on low 10 hours or on high 8 hours. Serve topped with shredded cheese, sour cream, and diced avocado, if desired.
Notes
We used The Wizard's brand of worcestershire sauce because it doesn't have added sugar.