Place the beef stew meat, carrots, potatoes, onion, beef broth, tomato paste, garlic, dried thyme, salt, and pepper into the slow cooker. Stir to combine the ingredients evenly.
Cover and cook on low for 8 hours until the beef is tender and the vegetables are soft.
In a mixing bowl, combine the flour, baking powder, salt, parsley, and rosemary. Pour in the milk and melted butter, then stir until a thick batter forms.
After the stew has cooked for 8 hours, drop spoonfuls of the dumpling batter directly onto the surface of the stew. Cover and cook on high for 1 more hour until the dumplings are firm and cooked through.