Add the oil or butter to the pot and melt using Saute on High. Add the onion, carrots, celery and any other vegetables - stir through for around 4 minutes to soften

Add the cooked chicken and stir through. Turn off the saute now.

Pour in the chicken stock. Add the pasta/noodles if you would like and some Salt & Pepper to your taste.

Pressure cook on high for 9 minutes. Quick release the steam.
Allow it cool a little before you serve