Combine meat and flour in a large plastic food storage bag and toss to coat evenly.
In a 6 quart saucepan brown meat in hot vegetable oil. Season with salt and pepper, if desired.
Add diced tomatoes, beef broth, carrots, potatoes and thyme. Bring to boil; reduce heat to medium-low, cover; and simmer for 1 hour or until beef is tender.
