In a large bowl, whisk together flour, baking powder, pepper, salt, and thyme.
Make a well in the center of the flour mixture and pour in the milk and melted butter. Using a wooden spoon or rubber spatula, stir together until a nice dough ball forms. If your dough seems too dry, you can add an extra tablespoon of milk.
Using a 1 ½ tablespoon cookie scoop, scoop dough and drop directly into the simmering soup. Place them around the pot, not all in the same place.
Place the lid on your pot and lower the heat to a low simmer (you don't want the soup to scorch, but you want it hot enough to cook the dumplings). Cook for 15 minutes. Cut one dumpling in half to make sure they are cooked through.
If the dumplings are done, serve while hot. If the dumplings are not done, cook for an additional 2-3 minutes.