Heat Instant Pot to High Sauté and add olive oil.
Season chicken on both sides with salt, garlic powder, ginger powder, and pepper (salt to taste).
When the oil is hot and shiny, add the seasoned chicken and sear for 3 minutes on each side.
Remove chicken to a plate.
Deglaze pot with water or chicken broth, then use a spatula or wooden spoon to scrape the browned bits from the bottom of the pot.
Add rice and stir into the broth or water, then lay the cooked chicken on top of the rice. Pour any reserved juices from the plate into the pot.
Drizzle teriyaki sauce over top of the chicken; DO NOT MIX.
Close the lid, turn knob to Sealing, then press the Manual or Pressure Cook button and adjust the time to 5 minutes. Allow a 10 minute natural pressure release (the Instant Pot will display L0:10), then turn the sealing knob from sealing to venting and open the lid.
Quickly add frozen vegetables and stir. Replace the lid and let steam through using the residual heat for about 5 minutes. Do not use the steam setting. Open the lid and ensure the vegetables are warmed through, then serve with extra teriyaki sauce and sesame seeds, if desired.