Absolutely! This recipe can easily be adapted for the slow cooker. You should still brown the meat and cook the vegetables in a skillet before adding them to the beef broth and other ingredients. Searing the meat on medium high heat brings out the flavour in a way that cooking it slowly the stew would not. The flavour of the onions and garlic is also enhanced by sauteeing. You can make your broth, flour and worcestershire sauce right in the slow cooker, then add the rest of the ingredients and cook for 6-8 hours.
Butter and herb mixture should be made in the skillet a few minutes before serving.