Add fire-roasted tomatoes to the slow cooker.
Add ranch dressing mix & seasonings. Stir into tomatoes until well mixed. This prevents the powders from clumping when the liquids are introduced.
Add all other ingredients except the cream cheese and garnishes. Stir to combine.
Gently set the block of cream cheese on top of mixture. Don't stir. Cover.
Cook on High for 4 hours or cook on Low for 8 hours.
Stir to incorporate the cream cheese and add any additional buffalo sauce if desired.
You can add some bleu cheese crumbles or corn chips to individual bowls if desired.