Combine the broth ingredients in an Instant Pot and add the chicken breasts. Seal the lid and turn the steam valve to the sealing position.
Set the Instant Pot to pressure cook/manual, high pressure. Set the cook time according to the size of your thawed chicken breasts. Do 8 minutes for 8 oz (small), 10 minutes for 10 oz (medium) or 12 minutes for 12 oz (large).
The Instant Pot will come to pressure (~10 min) and then will start counting down the cook time you set.
When it beeps, carefully turn the steam valve to venting. Let the steam release and the pin drop. Then, slowly twist open the lid.
Use a meat thermometer to check the chicken is at least 165F. If the temperature is lower, finish cooking using the Instant Pot's saute mode.
Once the chicken is done, unplug the Instant Pot & remove the chicken to a clean cutting board. Using meat shredders or forks, shred the chicken, then add it back into the Instant Pot to marinate in the juices.
Add rinsed lettuce leaves to a large mixing bowl.
Chop the remaining salad ingredients and add to the top.
Once the chicken has cooled, strain it over a liquid measuring bowl to conserve the broth for use as a salad dressing. Add the drained shredded chicken to the salad.
Store the broth in a mason jar with a tight lid. Store the salad with a secure top or saran wrap and keep in the fridge or individually portion out into separate tupperware. Enjoy within 3-4 days of making.