Set your Instant Pot to Sauté mode. Once it's hot, add the olive oil and chopped onions. Sauté for about 2-3 minutes until the onions are translucent.
Add the minced garlic, sliced carrots, and diced celery to the pot. Sauté for an additional 3-4 minutes until the vegetables start to soften.
Place the chicken breasts into the pot and pour in the chicken broth. Add the dried thyme, parsley, black pepper, and salt. Stir the mixture to combine.
Close the Instant Pot lid securely and ensure the valve is set to Sealing.
Set the Instant Pot to Manual mode and adjust the timer to 10 minutes.
Once the cooking time is complete, allow for a natural release for about 5-10 minutes, then carefully switch the valve to Venting to release any remaining pressure.
Open the pot and remove the cooked chicken breasts. Shred the chicken using two forks and return it to the pot.
Stir in the egg noodles. Set the Instant Pot to Sauté mode again and cook for about 5-7 minutes or until the noodles are tender. If the soup is too thick, add more broth or water to reach your desired consistency.
Taste the soup and adjust seasoning if necessary.
Serve hot, garnished with fresh parsley if desired.
Notes
Adjust salt to taste and add more broth if the soup is too thick.