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Caramelize the Onions:
In a large skillet, heat butter and olive oil over medium heat. Add sliced onions, salt, and pepper. Cook slowly, stirring occasionally, until onions are soft and golden brown (about 25-30 minutes).
Preheat Oven:
Preheat oven to 350°F (175°C).
Mix Ingredients:
In a bowl, combine caramelized onions, shredded cheese, and heavy cream (or sour cream). Mix well.
Assemble Casserole:
Transfer the onion mixture into a greased baking dish. Sprinkle breadcrumbs evenly over the top.
Bake:
Bake for 25-30 minutes until the top is golden and bubbly.
Serve:
Garnish with fresh thyme or parsley if desired. Serve warm as a side or main dish.
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 6
Calories: ~250 kcal per serving
Variations
Add cooked bacon bits for a smoky flavor.
Use goat cheese or feta for a tangy twist.
Mix in sliced mushrooms with onions for extra earthiness.
FAQ
Can I prepare this casserole ahead?
Yes, assemble it and refrigerate up to 24 hours before baking.
Can I freeze leftovers?
Yes, cool completely and freeze in an airtight container for up to 2 months. Reheat covered in the oven until warm.
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