Set instant pot to sauté, 10 minutes. Add olive oil to the pot. Sear the chicken for 2-3 minutes until lightly browned on all sides. (Doesn’t have to be cooked through, just a little cooked).
Add onions, garlic, celery and carrots. Sauté for 4-5 minutes until fragrant and slightly translucent.
Add all ingredients except frozen peas. Cover instant pot and set to Sealing, Manual Pressure for 12 minutes. It will take the pot about 5-7 minutes to come to pressure.
Once finished cooking, let the pressure naturally release for 5 minutes and then quick release the remaining pressure.