Wash and chop vegetables, peel and slice carrots, dice potatoes, chop onion, and mince garlic.
Heat olive oil in a skillet over medium-high heat, add beef cubes, and brown on all sides for 5-7 minutes. Transfer to slow cooker.
In the same skillet, sauté onion and garlic for 2-3 minutes until soft. Add to slow cooker with carrots, potatoes, peas, broth, tomato paste, Worcestershire sauce, thyme, rosemary, salt, and pepper. Stir to combine.
Cover slow cooker and cook on low for 7-8 hours or high for 4-5 hours.
About 30 minutes before serving, mix flour, baking powder, and salt in a bowl. Add milk and melted butter, mix until just combined.
Drop spoonfuls of dumpling batter onto the stew, cover, and cook on high for an additional 30 minutes.