Heat oil in a large skillet.
In a food storage bag or shallow bowl, combine the flour, salt, Creole seasoning, and garlic powder; toss beef with the mixture then brown in the hot oil along with the sliced onions.
Cook, stirring, for about 4-6 minutes, or until beef is browned and onions are tender.
Transfer the mixture to a 4-6 quart slow cooker.
Pour beef broth in the skillet and scrape up any browned bits; pour over the beef and onions in the slow cooker.
Add tomatoes and stir in curry powder and small white onions. Cover and cook on LOW heat for 8-10 hours.