Put medium size chicken breasts, vegetables, seasonings and chicken broth in your Instant Pot or pressure cooker. Make sure breasts are of similar sizes so they cook evenly.
Put lid on and set at high pressure for 12 minutes.
When done do a quick release and lift lid carefully.
Remove chicken and put in a bowl, cover to keep warm.
Set IP to saute and add cut up biscuits, put inside of liquid mixture.
Wait until it boils and allow to bubble for 1 full minute so it steams the biscuits. Turn pot off/cancel.
Put lid back on and set to manual, pressure, low, for 4 minutes. (if you don't have low function just use high for 1 minute)
Do a quick release when done and carefully lift lid. Set to saute again.
Pour milk in with liquid and stir slightly. Add 1 tbsp of cornstarch + a few tbsp of your hot broth into a bowl and whisk together until smooth ( if you desire it to be thicker) pour this mixture into your pot and stir gently. Can add another tbsp of cornstarch with same whisking if you want it even thicker.
Shred cooked chicken and add back into your pressure cooker.
Allow IP to start to boil/bubble again for about 1 full minute to mix all liquids. Serve!