Mix onion powder, garlic powder, oregano, paprika, salt and black pepper in a small bowl.
Pat dry the chicken on both sides. Rub the spice mix on both sides of the chicken breast.
Press the "saute" function on the instant pot and add the olive oil. Sear the chicken breasts for about 3 minutes on each side. Transfer them to a plate.
Add the chicken stock to the instant pot and scrape the bottom to get the brown bits.
Place the trivet in the instant pot and place the chicken breasts on the trivet.
Lock the lid and make sure the valve is on "sealing". Press the "pressure cook" button and make sure it's on "high".
Set the timer for 6 minutes on instant pot. It will take about 5-10 minutes for the instant pot to come to pressure.
Once the cooking time is up, do a natural pressure release for 5 minutes. Then turn the valve to "venting" and do a quick pressure release.
Open the lid and serve with your favorite sides.