Secure the lid with a valve set to seal. Using the manual pressure cook setting, set pressure cooker to high for 45 minutes. Once cook time has finished, allow it to naturally release for at least 30 minutes. Turn the release valve to vent and remove the lid.
Discard chicken and vegetables for pot. Pour chicken stock through a fine mesh strainer before storing in an airtight container.
Stock can be stored in the refrigerator for 5 days or in the freezer for up to 6 months.