Fantastic recipe! Saw a neighbor bring this to a block party, and everyone went bonkers for it!
French Onion Soup Casserole
All the cozy, savory flavors of traditional French onion soup—reimagined as a rich and cheesy baked casserole. This dish layers golden caramelized onions, toasty bread, and melty cheese for a hearty, spoonable comfort food perfect for sharing.
🧂 Ingredients:
| Ingredient | Amount |
|---|---|
| Unsalted butter | 3 tablespoons |
| Sweet onions, thinly sliced | 3 large |
| Garlic cloves, minced | 2 |
| Salt & black pepper | To taste |
| Thyme (dried or fresh) | 1 teaspoon |
| All-purpose flour | 2 tablespoons |
| Dry white wine | 1/2 cup |
| Beef broth | 2 cups |
| Chicken broth | 1 cup |
| Day-old French bread or baguette | 6 toasted slices |
| Gruyère cheese, shredded | 1 1/2 cups |
| Parmesan cheese, grated | 1/2 cup |
| Fresh parsley, chopped | 1/4 cup (for garnish) |
| Cooking spray | As needed |
👨🍳 Instructions:
1. Get Ready:
Preheat the oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish with cooking spray and set aside.
2. Caramelize the Onions:
Melt the butter in a large skillet or Dutch oven over medium heat. Add the sliced onions and cook slowly, stirring occasionally, until they’re deeply golden and tender—about 15 minutes.
3. Add Flavor:
Stir in garlic, thyme, salt, and pepper. Sauté for about a minute until fragrant.
4. Thicken with Flour & Deglaze:
Sprinkle flour over the onion mixture and stir constantly for a couple of minutes to eliminate any raw flour taste. Add white wine and stir to deglaze the pan, scraping up any flavorful bits stuck to the bottom.
5. Simmer the Broth:
Pour in both the beef and chicken broths. Bring everything to a simmer and cook for about 10 minutes to deepen the flavor.
6. Layer the Casserole:
Spoon half of the onion mixture into the baking dish. Top with half the toasted bread slices. Sprinkle with half the Gruyère and Parmesan cheeses. Repeat the layering with the rest of the onions, bread, and cheeses.
7. Bake to Perfection:
Place the dish uncovered in the oven and bake for 20–25 minutes, or until the cheese is melted, golden, and bubbling at the edges.
8. Serve & Garnish:
Let the casserole rest for a few minutes before serving. Sprinkle with fresh chopped parsley and enjoy warm.
This baked version of French onion soup is perfect for dinner parties, cozy evenings, or when you want to impress without the individual ramekins. Serve it alongside a green salad or roasted vegetables for a complete meal.
