Heat chicken broth in a large pot on medium-high heat until gently boiling. Add cream of chicken soup, garlic powder, black pepper, kosher salt, and onion powder; stir until incorporated.
Add chicken, carrots, and celery to the chicken broth mixture; stir.
Cut biscuits into small pieces (I usually do 6 per biscuit) and place in chicken broth mixture. Stir immediately and continue stirring for the next 3-5 minutes.
Reduce heat to medium or medium-low and continue cooking, stirring occasionally, for 20-25 minutes.
Test a dumpling; if it is still doughy on the inside, continue cooking for a few additional minutes. If you want a thinner consistency, you can add more chicken broth or a mixture of chicken broth and water.
Notes
If you want to add in more vegetables, you can add in frozen peas or corn towards the end of cooking.
Add biscuit pieces in small batches to prevent sticking.
Let biscuit pieces sit on top of the broth for a few minutes before stirring for fluffier dumplings.