Ingredients
Scale
- 4 large sweet yellow onions (about 1.5 lbs), thinly sliced
- 3 tbsp unsalted butter
- 2 cups beef broth
- 1/2 cup heavy cream
- 2 cups grated Gruyère cheese (divided)
- 1 cup panko breadcrumbs
- Salt and pepper to taste
Instructions
- In a large skillet over medium heat, melt the butter. Add the sliced onions and cook until caramelized and translucent (about 20 minutes), stirring frequently.
- Pour in beef broth and heavy cream; stir well and simmer for another 10 minutes.
- Mix in half of the grated Gruyère until melted, creating a creamy filling.
- Preheat your oven to 350°F (175°C) and grease a baking dish with butter.
- Pour the onion mixture into the dish, top with remaining Gruyère and panko breadcrumbs, then drizzle with melted butter if desired.
- Bake for 25-30 minutes or until golden brown and bubbly.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Category: Main
- Method: Baking
- Cuisine: French
Nutrition
- Serving Size: 1/8 of casserole (approximately 200g)
- Calories: 320
- Sugar: 4g
- Sodium: 650mg
- Fat: 22g
- Saturated Fat: 12g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 21g
- Fiber: 2g
- Protein: 10g
- Cholesterol: 50mg