Start by making the sauce. Dump the following ingredients into the removable pot: soy sauce, ketchup, minced garlic, apple cider vinegar, honey, and brown sugar. Add optional ingredients: bourbon and crushed red pepper. Stir to combine.
Place the chicken thighs into the sauce. Try to lay them in a single layer.
Place the pressure cooking lid on. Make sure the lid valve is set to SEAL. Set to high for 20 minutes.
Once it is done pressure cooking, allow the steam to naturally release for 5 minutes and then move the lid's valve from SEAL to VENT and quickly release the remaining steam.
Remove the chicken from the removable pot using tongs and shred the chicken.
Combine two Tablespoons of corn starch and about one Tablespoon of water in a separate bowl. Stir together until you make a paste or sludge.
Add the corn starch mixture to the removable pot with the sauce. Stir. This will thicken the sauce.
Add the shredded chicken back to the sauce.
Serve.