Turn on the sauté function on your electric pressure cooker and add the butter. When the butter is melted. Turn off the sauté function and add the chicken breasts and season with garlic salt.
Add 8 cups chicken stock to the pot and place the lid on the pot. Turn the knob to seal and cook under high pressure for 15 minutes.
The Instant Pot will display “on” while it is pressurizing. When at pressure, it will begin counting down from 15. When the cooking time is complete, carefully turn the knob to vent using oven mitts and/or a long wooden spoon to avoid any burns from the steam.
When all of the pressure has released and the pin drops on the lid, remove the lid. Using a tong, remove the chicken from the pot and place on a cutting board. Allow to rest for at least 5 minutes before shredding with two forks.
Meanwhile, add the carrots, celery, onion, chicken base, Greek Freak spice and egg noodles to the pot. Give a quick stir and place the lid back on the pot. Turn the knob to seal and cook under high pressure for 4 minutes.
When the cooking time is complete, carefully turn the knob to vent. When all of the pressure has released and the pin drops on the lid, remove the lid.
Stir the shredded chicken and lemon juice into the soup and enjoy!
If you like a little more kick to your soup, sprinkle a little extra Greek Freak on your bowl of soup and stir in while hot.