Heat oil in a large pot over medium heat. Add onion, celery, and carrots. Cover and sauté for 5 minutes, stirring often.
Add chicken, soup, ½ cup water, and pepper. Stir to combine.
Cover and cook on low heat for 20 minutes.
In a small bowl, stir together pancake mix and remaining cup of water.
Drop by tablespoons onto stew mixture. Cover and cook for 10 minutes, then uncover and cook for 10 minutes more, or until dumplings are cooked through.
Notes
Canned carrots can be replaced with fresh carrots, peas, or green beans.