Trim off visible fat from chicken thighs. Don't worry if you don't get it all, just the easy stuff.
Spray Instant Pot with olive oil spray. Press, "Sauté." When hot, add chopped onions and garlic. Sauté for a few minutes until onions are soft and starting to brown.
Add the Frank's Red Hot Sauce, broth or water if using it (make sure you have at least 3/4 c. liquid total in Instant Pot), cayenne pepper, smoked paprika, chicken and butter. Stir well and try to get the chicken down into the liquid.
Press, "Manual or Pressure," and cook on high for 9 minutes with the seal on. Allow to natural release for at least 5 minutes.
Remove chicken with slotted spoon and shred pieces with 2 forks.
To the sauce, add shredded cheese, and cream cheese chunks. Stir until melted. If it doesn't melt completely, turn Instant Pot back on, "Sauté," and heat until melted. Add chicken back into sauce.
Prepare the bowls. For each bowl add: 1 c. shredded cabbage, 3/4 c. buffalo chicken with some sauce, 1/4 c. shredded carrots, celery, green onions, and blue cheese if desired. Enjoy!