In a bowl, coat the beef in flour
Heat a pan to medium heat, add olive oil, garlic, onions, thyme, and rosemary. Cook until the onions are tender. Add the beef and sear all sides. Once the beef has browned, add the Marsala wine
Transfer the ingredients from the pan into the slow cooker
Add the broth, potatoes and tomatoes into the crock pot and cook on low for 8 hours. During the last hour of cooking, taste the soup to see if salt and pepper is needed
Serve and enjoy!