In a large, heavy pan saute celery and carrots in butter for about 5 minutes
Add in the broth and seasonings and bring to a boil
Reduce heat and simmer for 5-10 minutes. Add in chicken
Make dumplings: Combine Bisquick, milk and sour cream
Drop dumplings by the spoonful onto simmering broth
Cover pan and simmer for 10-15 minutes or until the dumplings are cooked through (insert a toothpick) Do not lift the cover while cooking
Notes
Just a few words of caution. The liquid will be hot, very hot and you will want to eat it right away but trust me, let it cool a bit or at least blow on it!
At first, it may seem like there is too much broth but you will soon discover that as you begin eating and cutting into the dumplings they will start to dissolve a bit and mix in with the broth and it will thicken up the broth.
You can use a bag of frozen veggies if you prefer, just add them in with the chicken.