Return the browned chicken to the pot. Pour in the chicken broth. Add Italian seasoning, salt, and pepper.
Secure the lid and set the vent to ‘Sealing’. Select ‘Manual’ or ‘Pressure Cook’ (High Pressure) for 5 minutes.
When the cooking cycle finishes, allow a Natural Pressure Release (NPR) for 5 minutes, then carefully move the valve to ‘Venting’ for a Quick Release (QR) of any remaining pressure.
Open the lid. Stir in the cubed cream cheese until it melts and the broth becomes creamy.
Stir in the fresh spinach until wilted, if using. Serve immediately.
Notes
For a thicker soup, mix 1 tablespoon of cornstarch with 2 tablespoons of cold water before stirring it into the simmering soup in the final step.
You can use pre-cooked rotisserie chicken; add it during the last 5 minutes of simmering with the tortellini instead of cooking raw chicken at the start.