Sprinkle salt and pepper on frozen chicken thighs. Add broth to bottom of Instant Pot, then set trivet inside. Place seasoned chicken thighs on trivet.
Seal and cook on high pressure for 13 minutes. See Notes if cooking boneless chicken thighs. While chicken is in Instant Pot, preheat broiler.
Let the pressure release naturally for 5-10 minutes. Place chicken thighs on a baking sheet and pat dry. Add more salt or seasoning if desired.
Place chicken thighs under the broiler, about 10 to 12 inches from heat. Broil 5-10 minutes or until skin is golden brown. Note: if you skip this step, your chicken thighs may be undercooked. This is an important part of the recipe.
Boneless Thighs: For boneless thighs, cook on High Manual Pressure in the Instant Pot for 8 minutes.
Chicken Broth: For a 6-quart Instant Pot, use 1 cup of broth. For an 8-quart Instant Pot, use 1.5 cups of broth.
For food safety reasons, cooked chicken should reach a minimum internal temperature of 165° Fahrenheit. If you skip the broiling step in this recipe, your chicken may be undercooked. Cook times can vary slightly based on the size of chicken thighs used.