French Onion Potato Soup

Name: French Onion Potato Soup
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: American, French
Ingredients: 6 tablespoons butter; 4 sweet onions, thinly sliced; 2 cloves garlic, minced or grated; 1 tablespoon brown sugar; 3 tablespoons all-purpose flour; 1 1/2 cups red wine; 2 quarts low sodium beef broth; 1 tablespoon Worcestershire sauce; 2 bay leaves; 3-4 fresh thyme sprigs, plus more for serving; pinch of black pepper; 1 pound mini baby potatoes, halved if large; 6 slices french bread; 1 1/2 cups shredded Gruyere cheese