Set out a large 6-quart slow cooker. Add in the cream cheese, chopped chicken, 1 cup of shredded cheddar cheese, sour cream, Frank’s RedHot, ½ cup of chopped scallions, crumbled blue cheese, and ranch dip mix. Reserve the remaining cheddar and scallions for later. Mix well, then spread the dip out evenly in the crock. If needed, wipe the sides of the crockpot with a wet paper towel. Cover and set on LOW for 2 to 4 hours. When ready to serve, sprinkle the top with the remaining cheddar cheese and scallions. Serve warm with chips, crackers, or fresh cut veggies!