Sweet onion casserole is a delicious and comforting dish that highlights the natural sweetness of onions. Here’s a simple recipe for making a sweet onion casserole:


  • 4 large sweet onions, thinly sliced
  • 3 tablespoons butter
  • 2 tablespoons olive oil
  • 2 teaspoons brown sugar
  • 1 teaspoon balsamic vinegar
  • 1 teaspoon dried thyme
  • Salt and black pepper, to taste
  • 1 cup shredded Gruyere or Swiss cheese
  • 1/2 cup grated Parmesan cheese
  • 1 cup breadcrumbs (for topping)
  • Chopped fresh parsley for garnish (optional)


1. Preheat the Oven:

Preheat your oven to 375°F (190°C).

2. Cook the Onions:

a. In a large skillet, melt the butter and olive oil over medium heat.

b. Add the thinly sliced onions to the skillet and cook, stirring occasionally, until the onions are soft and golden brown.

c. Sprinkle brown sugar over the onions and continue cooking for a few more minutes until the sugar caramelizes.

d. Stir in balsamic vinegar, dried thyme, salt, and black pepper. Cook for an additional 1-2 minutes to let the flavors meld.

3. Assemble the Casserole:

a. Transfer the cooked onions to a greased baking dish.

b. Sprinkle the shredded Gruyere or Swiss cheese over the onions.

c. In a bowl, mix together Parmesan cheese and breadcrumbs. Sprinkle this mixture evenly over the cheese and onions.

4. Bake:

Bake in the preheated oven for 20-25 minutes or until the top is golden brown and the cheese is melted and bubbly.

5. Garnish and Serve:

a. Remove the casserole from the oven and let it cool for a few minutes.

b. Garnish with chopped fresh parsley if desired.

c. Serve the sweet onion casserole as a delicious side dish or as part of a larger meal.

This sweet onion casserole is a savory and flavorful dish that pairs well with various main courses. The combination of caramelized sweet onions, melted cheese, and a crunchy breadcrumb topping makes it a comforting and crowd-pleasing choice. Enjoy!

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