French Onion Casserole is a comforting and flavorful dish that captures the rich taste of caramelized onions, creamy cheese, and crispy bread crumbs baked to perfection. This classic recipe is inspired by the famous French onion soup but takes it to another level of indulgence by transforming it into a hearty casserole. It’s perfect for family dinners, holiday gatherings, or any cozy night when you crave something warm, savory, and satisfying. The golden melted cheese on top and the aroma of onions and herbs make it irresistible, and it pairs beautifully with roasted meats or fresh green salads.
Ingredients
- 6 large yellow onions, thinly sliced
- 3 tablespoons butter
- 1 tablespoon olive oil
- 1 teaspoon salt
- 1 teaspoon sugar
- 2 cups beef broth
- 1 cup sour cream
- 1 cup shredded Gruyère or Swiss cheese
- 1 cup shredded mozzarella cheese
- 1 teaspoon dried thyme
- 1 cup crushed Ritz crackers or bread crumbs
- 2 tablespoons melted butter for topping
- Black pepper to taste
Instructions
- In a large skillet, heat butter and olive oil over medium heat. Add sliced onions and sprinkle with salt and sugar. Cook slowly, stirring frequently, until onions turn golden brown and caramelized, about 25–30 minutes.
- Pour in beef broth and let it simmer for 5 minutes until slightly reduced. Remove from heat and stir in sour cream, thyme, and black pepper.
- Preheat your oven to 350°F (175°C). Pour the onion mixture into a greased baking dish. Mix the shredded cheeses and sprinkle evenly over the onions. In a small bowl, combine crushed crackers with melted butter and sprinkle on top. Bake uncovered for 25–30 minutes until the topping is golden brown and bubbly. Serve hot.
Servings
Serves 6 people
Nutritional Info (per serving, approx.)
Calories: 320
Protein: 10g
Fat: 22g
Carbohydrates: 18g
Fiber: 2g
Sodium: 420mg
Sugar: 6g
Notes
You can substitute sour cream with Greek yogurt for a lighter version. Use vegetable broth instead of beef broth for a vegetarian-friendly casserole. The dish tastes even better the next day as the flavors meld together overnight.
Tips
Caramelize onions slowly over low heat for the best flavor. Mixing two kinds of cheese adds depth to the taste. For a crispy top, broil the casserole for the last 2 minutes of baking. This casserole can be prepped a day ahead and refrigerated before baking.
Health Benefits
Onions are packed with antioxidants that support heart health and reduce inflammation. The dish contains calcium and protein from cheese, promoting bone strength. When made with olive oil and moderate cheese, it provides healthy fats and balanced nutrition. Eating this in moderation contributes to overall wellness while satisfying your comfort food cravings.