COMBINE & SIMMER: Place the chicken, water, quartered onion, garlic, thyme, and bay leaves into a large pot. Season generously with salt and pepper. Bring to a boil, then reduce the heat to a gentle simmer.
COOK THE CHICKEN: Let it simmer for 30-40 minutes, skimming off any foam that rises to the top, until the chicken is tender and cooked through.
STRAIN & SHRED: Remove the chicken from the pot and set it aside to cool. Strain the broth to remove the herbs and vegetables, then pour the clear broth back into the pot. Once the chicken is cool enough to handle, shred it into bite-sized pieces.
MIX DRY INGREDIENTS: While the chicken cools, whisk together the flour, baking powder, salt, garlic powder, onion powder, and black pepper in a medium bowl.
ADD WET INGREDIENTS: Pour in the melted butter and milk. Stir gently with a fork just until a thick batter forms. Be careful not to overmix.
ADD CHICKEN: Add the shredded chicken back to the pot of broth and bring it to a steady, gentle simmer.
DROP DUMPLINGS:
Using a tablespoon, drop spoonfuls of the dumpling batter into the simmering broth, leaving a little space between each one.
COVER & COOK: Cover the pot tightly and let the dumplings steam for 15-20 minutes without lifting the lid. They are done when they are light, fluffy, and a toothpick inserted into the center of a dumpling comes out clean. Serve hot.