Add all of the ingredients, except for the frozen vegetables, to your Instant Pot Pressure Cooker.
Place the lid on your pot and make sure the vent valve is in the SEALING position.
Using the MANUAL function on your Instant Pot, high pressure, use the +/- buttons to program the pot for 10 minutes.
When the time is up let the pot naturally release the pressure for at least 15 minutes.
Remove chicken breasts and shred. Add the shredded chicken and frozen vegetables to the pot and stir. Select the sauté function and let the vegetables warm, stirring frequently, for about two minutes. Salt to taste and serve warm.