Add cubed chicken, potatoes, baby carrots, celery, and frozen mixed vegetables to the slow cooker.
Pour in the cream of chicken soup and add the chicken bouillon (if using).
Season with black pepper, garlic salt, and celery salt. Stir everything together.
Cover and cook on low for 6-8 hours or high for 3-4 hours until the chicken is tender.
Stir well before serving to combine the flavors evenly.
Serve hot as is or with biscuits for a traditional pot pie experience.
Store leftovers in an airtight container in the refrigerator for up to 4 days.
Enjoy a cozy, fuss-free meal with minimal effort!