Season both sides of the chicken breasts with 1 teaspoon garlic powder, 1 teaspoon onion powder, ¼ teaspoon ground oregano, salt, and pepper to taste. Rub the spices into the chicken breasts.
Heat 1 tablespoon of butter in a large soup pot or Dutch oven over medium-high heat. Add the chicken and cook until browned on all sides, about 4-5 minutes. Remove the chicken and set aside.
In the same pot, add the onions, carrots, celery, and garlic and cook until translucent, about 3-4 minutes.
Sprinkle the flour throughout and stir well to combine. Add the flour in stages to avoid excess drying.
Gradually whisk in the chicken broth and stir repeatedly, ensuring there are no lumps. Deglaze the bottom of the pan using your spoon. Add the chicken back to the pot.
Bring the mixture to a rolling boil and add 1 teaspoon onion powder, 1 teaspoon garlic powder, 1 teaspoon dried basil, ¼ teaspoon ground oregano, salt, and pepper to taste. Cover the pot with the lid and lower the heat to low to let the soup simmer for 15 minutes.
While the soup cooks, prepare the dumplings. Cut the dumplings into 4 pieces per biscuit. Melt 1 tablespoon of butter and combine the remaining minced garlic cloves and optional parsley. Glaze the top of each biscuit with the melted garlic butter.
Open the pot and remove the chicken and shred it using 2 forks. Return the chicken to the pot along with ½ cup of optional half and half. Stir. Taste repeatedly and adjust the spices, salt, and pepper if needed to suit your taste.
Drop the biscuit chunks right on top of the simmering chicken mixture in a single layer. Don’t stir them in, let them sit on top like a lid so they steam and puff up
Put a lid on the pot and let the biscuit pieces cook for 15-20 minutes, or until they’re fluffy and cooked through in the center. Try not to lift the lid too often so the steam stays trapped. If you lift the lid too soon, the texture of the dumplings will be gummy. I let mine cook for 20 minutes.
Once the biscuits are done, remove the lid and check for doneness by cutting into the thickest piece. If it’s no longer doughy inside, you’re good to go. Serve hot with the dumplings floating right on top.