01 - Heat olive oil in a large 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 - Stir in the minced garlic, dried thyme, smoked paprika, and tomato paste. Cook for 2 minutes, allowing the spices to bloom and the tomato paste to darken slightly.
03 - Add the rinsed lentils and bay leaf to the pot. Pour in the vegetable broth and bring everything to a 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, combine the flour, baking powder, salt, and dried herbs in a mixing bowl. Add the cubed cold butter and rub it into the flour using your fingertips until the mixture resembles coarse crumbs. Stir in the milk until a soft, slightly sticky dough forms.
05 - Remove and discard the bay leaf from the lentil mixture. Drop rounded tablespoonfuls of dumpling dough evenly over the surface of the simmering stew, leaving space between each one for expansion.
06 - Cover the pot tightly and cook over low heat for 15 minutes. Do not lift the lid during this time, as the steam is essential for cooking the dumplings properly.
07 - Check that the dumplings are puffed and cooked through. Ladle the stew and dumplings into bowls and serve hot.