Coat beef with flour. Heat oil in large skillet on medium-high heat. Add beef; cook in batches until browned on all sides. Add onion; cook about 3 minutes, stirring occasionally.
Place potatoes in slow cooker. Top with beef and onions.
Mix broth, tomato paste, paprika, garlic salt and caraway seed in small bowl. Pour over beef. Cover.
Cook 8 hours on LOW or 4 hours on HIGH. Stir in bell pepper during the last 15 minutes of cooking. Thicken with additional flour, if desired.