Place chicken into instant pot with rack at the bottom.
Drizzle with olive oil.
Salt and pepper chicken with 1 tsp salt and 1/2 tsp pepper.
Add 1 cup of water to the bottom of the instant pot.
Cook on high pressure for 55 minutes thawed or from frozen.
While the chicken cooks, wash your celery, peel and wash your carrots.
Dice the onion and chop the celery and carrots.
Divide the vegetables evenly between 4 quart jars.
When the chicken is done, place onto a baking sheet or large cutting board.
Pick the meat from the bones and shred. Combine the white and dark meat to ensure each jar gets a mixture of both.
Divide the chicken between the 4 quart jars.
Add the salt, pepper, and parsley if using.
Top with filtered water to 1 inch head space.
Remove bubbles.
Wipe rims with white vinegar on a clean rag.
Add gaskets and lids to fingertip tightness.
Process quart jars at 10 lbs pressure for 1 hour and 30 minutes following your pressure canner's manual.
Turn off heat and cool to zero pressure.
Allow to rest for 5 minutes before removing lid.
Allow the jars to cool for 10 additional minutes in the canner.
Remove jars and rest for 24 hours.
Remove the bands and check the seals.
Unsealed jars should be eaten right away, or stored in the fridge for up to 1 week.
Sealed jars should be wiped clean, labeled and put away in a cool, dark place for up to 1 year for maximum freshness.
Serve alone, or with noodles, rice, or dumplings.
Enjoy!