Cooking the chicken recipe in a single layer allows the chicken to brown and not stew. The browned bits left behind help to season the rice.
Remove lid from a 6-quart Instant Pot®. Press [Sauté], and use [Adjust] to select "More" mode. When the word "Hot" appears, swirl in 1 tablespoon of the oil. Add chicken to cooker in a single layer, and cook 2 minutes; stir and cook 4 minutes or until done. Remove chicken from cooker; set aside.
Add remaining 1 tablespoon oil, rice, and 5 cups water to cooker, scraping cooker to loosen browned bits. Turn cooker off.
Close and lock the lid of the Instant Pot®. Turn the steam release handle to "Sealing" position. Press [Manual]; select "High Pressure," and use [-] or [+] to choose 8 minutes pressure cooking time. When time is up, turn cooker off. Open the cooker using Quick Pressure Release (page 4). While rice mixture cooks, place onion in a medium bowl. Add cold water to cover; let stand 10 minutes. Drain.
After pressure is released, stir broccoli into rice mixture in cooker; let stand 30 seconds. Drain broccoli mixture through a fine sieve; rinse with cold water, and drain well.
Place broccoli mixture in a large bowl. Add chicken, onion, bell pepper, and remaining ingredients, tossing gently.