In a mixing bowl, combine the chicken thighs, salt, garlic powder, onion powder, paprika, and pepper. Mix until all of the chicken is fully coated in the seasoning.
Add the chicken to the Instant Pot. Sear the chicken just until the outside is golden brown and gets a nice sear. It will finish cooking with the rice and broccoli.
Press CANCEL on the Instant Pot.
Pour in the chicken stock and deglaze the bottom of the pot, getting all of the little bits up. There is a lot of flavor in these, plus it will help prevent you from getting a burn notice when cooking.
Add the rice and broccoli into the Instant Pot and mix to combine. Be sure all of the rice is submerged in the liquid.
Place the lid securely on the Instant Pot and set the pressure valve to SEALING.
Cook on HIGH PRESSURE for 10 minutes.
QUICK RELEASE the pressure by setting the pressure valve to VENTING.
Carefully open the lid and and stir in the grated cheddar cheese.