- 4 large sweet onions (like Vidalia), thinly sliced
- 2 tablespoons unsalted butter
- 1 tablespoon olive oil
- 1 cup heavy cream (or half-and-half for a lighter option)
- 1 cup shredded cheddar cheese
- 1/2 cup sour cream
- 1 teaspoon garlic powder
- 1 teaspoon dried thyme (or parsley)
- Salt and black pepper, to taste
For the Topping:
- 1 cup breadcrumbs (panko works great for extra crunch)
- 2 tablespoons melted butter
- Optional: 1/4 cup grated Parmesan cheese (for added flavor)
Step-by-Step Instructions
1. Caramelize the Onions
- In a large skillet over medium heat, melt the butter and olive oil together.
- Add the sliced onions and cook, stirring occasionally, for 20–25 minutes, or until they are soft, golden brown, and caramelized. Season with a pinch of salt to help draw out moisture.
- Remove from heat and set aside.
2. Preheat the Oven
- Preheat your oven to 375°F (190°C).
- Lightly grease a baking dish or casserole pan for easy cleanup.
3. Prepare the Filling
- In a mixing bowl, combine the caramelized onions, heavy cream, shredded cheddar cheese, sour cream, garlic powder, thyme, salt, and black pepper. Stir until evenly mixed.
- Pour the mixture into the prepared baking dish and spread it out evenly.
4. Add the Topping
- In a small bowl, mix the breadcrumbs, melted butter, and optional Parmesan cheese until the crumbs are evenly coated.
- Sprinkle the breadcrumb mixture evenly over the top of the casserole.
5. Bake
- Bake in the preheated oven for 25–30 minutes, or until the casserole is bubbly and the topping is golden brown.
- Optional: Broil for the last 2–3 minutes to achieve an extra crispy crust (watch closely to avoid burning).
6. Serve and Enjoy
- Remove the casserole from the oven and let it cool slightly before serving.
- Optional: Garnish with fresh parsley for added color and freshness.
- Enjoy every bite of this creamy, cheesy, and indulgent Southern Sweet Onion Casserole!
- Perfect as a standalone side dish or paired with roasted chicken, grilled steak, or fried pork chops for a complete meal.
Tips for Success
- Use Fresh Ingredients: Fresh garlic, herbs, and high-quality cheese make a noticeable difference in flavor.
- Switch Cheeses: Substitute cheddar with Monterey Jack, Gruyère, or a blend for variety.
- Add Protein: Stir in cooked bacon, ham, or sausage for extra heartiness.
- Store Leftovers: Store in an airtight container in the fridge for up to 3 days. Reheat gently in the oven or microwave before serving.
Why This Recipe Works
This Southern Sweet Onion Casserole combines the natural sweetness of caramelized onions with the creamy richness of cheese and sour cream into a dish that’s both satisfying and indulgent. The crispy breadcrumb topping adds a delightful contrast to the creamy filling, while the customizable options allow you to tailor the recipe to your taste. Whether served as a standalone side dish or customized with your favorite mix-ins, this recipe delivers big on taste and simplicity without requiring advanced cooking skills.
Conclusion: A Dish Everyone Will Love
Whether you’re craving something creamy and cheesy, looking for a way to elevate your side dishes, or simply want to enjoy a homemade treat, this Southern Sweet Onion Casserole is sure to delight. Its bold flavors, satisfying textures, and customizable options make it a standout recipe that’s as practical as it is delicious. Plus, its versatility means you can tailor it to suit any occasion.
We’d love to see your creations! Tag us in your photos or share your favorite variations—your take on this casserole might just inspire others to try it too! 🍴✨