Turn your Instant Pot to the saute setting. Add the butter and melt. Add the onions, carrots, and celery and saute for 3 minutes until onion softens.
Season with salt and pepper, add the thyme parsley, oregano, and stir. Pour in the chicken broth. Add the chicken pieces and add another 4 cups of water.
Close the lid. Set the Instant Pot to the Soup setting and the time to 7 minutes.
Once the Instant Pot is complete, wait until the natural release cycle is complete - about 10 minutes. Carefully unlock and remove the lid.
Remove the chicken pieces and shred with 2 forks. Set aside.
Add the noodles to the soup and set the Instant Pot to the saute setting again. Cook for another 6 minutes or until the noodles are cooked.
Turn off the Instant Pot by pressing the Cancel button. Add the shredded chicken back to the instant pot. Taste for seasoning and adjust as necessary. Garnish with fresh parsley.