In a large pot, add a small amount of oil and cook the marinated chicken.
Finely chop two stalks of celery and slice two carrots diagonally into pieces. Dice one onion and add it to the chicken that has been cooked.
Stir the mixture well and pour in enough chicken stock to cover the chicken and vegetables in the pot. Bring the contents to a gentle boil.
If you have any leftover stock, allow it to cool before storing it for later use. The stock will keep for up to 3 days in the refrigerator or 3 to 4 months if frozen.
Dust your counter with flour and roll out your dumpling dough into a flat sheet, keeping it somewhat thick unless you prefer thin dumplings.
Using a knife or a pizza cutter, slice the dough into strips that are 1 to 2 inches wide. The size is really up to your personal preference for how large you want the dumplings to be.
Add the dumpling strips to the pot containing the chicken, vegetables, and stock. Cook for approximately 20 minutes.
The dumplings will naturally thicken the stock due to the excess flour on their surface. If the consistency isn't thick enough to your liking, you can make a slurry by mixing 2 tablespoons of cornstarch with a small amount of water. Gradually add this slurry to the pot with the cooking dumplings until you reach your preferred sauce thickness.
Serve the dish hot in a bowl, or spoon it over rice if you prefer.