While the Instant Pot is heating up, place the chicken breasts side-by-side in a freezer bag.
Press out as much air as you can and zip the bag closed except for 1 inch.
Once the temperature has been reached the Instant Pot will beep. Measure the temperature of the water with a digital thermometer to make sure the desired temperature has been reached. Gradually lower the bag down into the water using the displacement method. *
Close the bag all the way until the bag is completely sealed, but keep the opening of the bag above the water level.
Close the lid.
When the sous vide cooking time is up, the Instant Pot will beep.
Press Cancel, open the lid and using tongs, remove the freezer bag.
Open the bag and and transfer the chicken breast to a plate or cutting board lined with paper towels.
Allow the chicken to rest for 10 minutes.
Dry the chicken thoroughly and sear on high heat on a grill or cast iron pan until browned on both sides, if desired.
Use the chicken in any recipe that calls for cooked chicken.