Crockpot Swiss Steaks

Name: Crockpot Swiss Steaks
Prep time: 20 min
Cook time: 6 h 15 min
Total time: 6 h 35 min
Cuisine: American
Ingredients: 1 ½ pounds round steak (or cube steaks or minute steaks); 2 carrots (sliced into 1" pieces); 1 stalk celery (sliced into 1" pieces); ½ onion (sliced ½" ); 2 cloves garlic (sliced); ¼ cup flour; 1 tablespoon olive oil; ½ cup white wine; 1 cup beef broth; 14 oz canned diced tomatoes, with juice; 2 tablespoons tomato paste; 1 tablespoon Worcestershire sauce; ½ teaspoon dried thyme leaves; salt and pepper to taste; corn starch for thickening (optional)