Turn the Instant Pot to Saute. Add a bit of oil. Put in onions and garlic and stir till the smell feels warm.
Add chicken, carrots, celery, and other veggies. It does not need to look fancy.
Pour in the chicken broth. Everything looks cozy and colorful.
Sprinkle in Italian seasoning with salt and pepper.
Close the lid. Set to High Pressure for 10 minutes.
Let it sit for 5 minutes after it beeps, then quick release the rest of the steam.
Take out the chicken and shred it with two forks. It gets soft fast.
Put chicken back in. Stir everything. Taste and adjust seasonings.