Cook. 8 h 10 m; Ready In. 8 h 30 m; Scatter sliced onion in the bottom of a slow cooker, then alternately layer carrots and potatoes. Heat oil in a large skillet over medium heat and season London broil with Creole seasoning. Sear beef in hot oil until well browned, 3 to 5 minutes per side. Transfer meat the slow cooker. read more