Place the beef cubes in a bowl and toss them with the flour, salt, and pepper until evenly coated.
Heat a skillet over medium heat and brown the beef on all sides, then transfer it to the slow cooker.
Add the carrots, potatoes, parsnips, onion, and garlic to the slow cooker.
Stir in the beef broth, tomato paste, rosemary, and bay leaves.
Cover and cook on low for 8 hours until the beef is tender and the vegetables are soft.
Remove the bay leaves, taste, and adjust salt and pepper if needed before serving.