01 - Heat olive oil in a large heavy-bottomed pot over medium heat. Add the diced onion, carrots, and celery. Cook for 5 to 7 minutes, stirring occasionally, until the vegetables are softened and the onion is translucent.
02 - Add the minced garlic, dried thyme, smoked paprika, and tomato paste to the pot. Stir continuously and cook for 2 minutes until fragrant and the tomato paste darkens slightly.
03 - Stir in the rinsed lentils and bay leaf. Pour in the vegetable broth and bring the mixture to a rolling boil. Once boiling, reduce the heat to low, cover the pot, and simmer for 25 to 30 minutes until the lentils are tender. Season with salt and pepper to taste.
04 - While the lentils simmer, whisk together the flour, baking powder, salt, and dried herbs in a mixing bowl. Add the cubed cold butter and cut it in using your fingers or a pastry blender until the mixture resembles coarse crumbs. Pour in the milk and stir gently until a soft, slightly sticky dough forms.
05 - Remove and discard the bay leaf from the lentil stew. Drop rounded tablespoonfuls of the dumpling dough evenly over the surface of the simmering stew, spacing them about 1 inch apart.
06 - Cover the pot tightly and let the dumplings steam over low heat for 15 minutes. Do not lift the lid during this time, as the steam is essential for proper cooking.
07 - Check the dumplings for doneness by cutting one open; it should be puffed, light, and cooked all the way through. Ladle the stew into bowls with dumplings on top and serve hot.