Add all ingredients to your slow cooker (minus extra cheese and everything bagel seasoning).
Cook on low for 2 hours or until the cheese is completely melted.
Stir and season more as needed. This is more salt can be added per your preference.
Add the extra cheese on top and let cook on high for 20-30 more minutes. Then sprinkle the Everything Bagel seasoning on top if you would like.
Serve and enjoy.