French Onion Soup by Kelsey Nixon

I love any French Onion soup, and this one is a good one. From Cooking Channel's Kelsey Nixon.

• Ready In: 1 hr 30 mins
• Serves: 4-6

Ingredients

• 1⁄2 cup unsalted butter
• 2  lbs yellow onions, halved and thinly sliced lengthwise (about 6 medium)
• 8 -10  sprigs fresh thyme
• 1  teaspoon kosher salt, plus more for seasoning
• 1  teaspoon fresh ground black pepper, plus more as necessary
• 1  tablespoon flour
• 1  cup dry white wine
• 4  cups  beef stock or 4  cups low sodium beef broth
• 2  cups  chicken stock or 2  cups low sodium chicken broth
• 1 1⁄2 cups  cubed  ciabatta
• 3  cups  grated gruyere cheese

Directions

1. In a large heavy-bottom pot, melt the butter over low heat. Add the sliced onions, thyme, salt, and pepper and continue to cook, stirring occasionally until the onions become a deep golden brown and very soft, about 30 minutes.
2. Add the flour and cook for 1 to 2 minutes. Add the white wine and scrape up any dry bits on the bottom of the pan, increasing the heat to a boil for 2 to 3 minutes. Add the beef stock, and the chicken stock, and allow the soup to simmer for an additional 30 minutes as the flavors develop. Season the soup generously with salt, and pepper, to taste.
3. Preheat the oven to broil, or turn on the broiler. Arrange the ciabatta cubes on a baking sheet and toast until crispy, about 3 to 5 minutes.
4. Remove the thyme sprigs and pour the soup into 4 to 6 oven-safe crocks or bowls. Top with the toasted ciabatta cubes and a generous amount of grated Gruyere.
5. Place the crocks or bowls under the broiler for 3 to 5 minutes, or until the cheese is melted and begins to brown.