why make this recipe
Southern Sweet Onion Casserole is a delightful dish that brings warmth and comfort to any meal. Sweet onions, like Vidalia, are the star of this recipe, providing a rich flavor that pairs beautifully with creamy cheeses and buttery crackers. This casserole is perfect for family gatherings, potlucks, or holiday dinners, and it’s easy to make. Its rich taste and simple ingredients make it a crowd-pleaser that everyone will enjoy.
how to make Southern Sweet Onion Casserole
Ingredients:
- 4 large sweet onions (such as Vidalia, thinly sliced)
- 4 tablespoons unsalted butter
- 1 teaspoon salt
- ½ teaspoon black pepper
- 1 teaspoon sugar (optional, enhances sweetness)
- 1 cup shredded sharp cheddar cheese
- ½ cup shredded mozzarella cheese
- 1 cup sour cream
- 2 large eggs (lightly beaten)
- 1 cup crushed butter crackers (like Ritz)
- 2 tablespoons melted butter (for topping)
Directions:
Prepare the onions: Preheat your oven to 350°F (175°C). In a large skillet, melt 4 tablespoons of butter over medium heat. Add the sliced onions, salt, pepper, and optional sugar. Cook until the onions are soft and lightly golden, about 15 minutes, stirring often.
Mix the filling: Remove the skillet from heat. Stir in the sour cream and beaten eggs until smooth. Fold in ½ cup of cheddar and ½ cup of mozzarella cheese.
Assemble the casserole: Transfer the onion mixture into a greased 9×13-inch baking dish. Sprinkle the remaining cheeses over the top. In a small bowl, mix the crushed crackers with the melted butter, then spread this mixture evenly over the casserole.
Bake: Bake uncovered for 30–35 minutes, until the casserole is golden and bubbly.
Serve: Let the casserole sit for 5 minutes before serving. It is perfect as a side with roasted meats, barbecue, or during holiday meals.
how to serve Southern Sweet Onion Casserole
Southern Sweet Onion Casserole is versatile and can be served with a variety of main dishes. It pairs well with roasted chicken, grilled meats, and even barbecued ribs. You can also enjoy it as a hearty side at family gatherings or holiday feasts. Each bite is creamy and rich, making it irresistible.
how to store Southern Sweet Onion Casserole
If you have leftovers, let the casserole cool completely before storing. Place it in an airtight container in the refrigerator. It will keep well for about 3 to 4 days. To reheat, place individual portions in the microwave or warm the entire casserole in the oven until heated through.
tips to make Southern Sweet Onion Casserole
- For added flavor, try using a mix of cheddar cheeses.
- If you prefer a bit of crunch, toast the crushed crackers in a skillet before adding them on top.
- Feel free to adjust the amount of sugar based on how sweet your onions are.
variation
You can add cooked bacon or ham pieces for a meaty twist on this casserole. Another delicious variation is to incorporate fresh herbs like thyme or rosemary for added flavor.
FAQs
1. Can I use other types of onions?
Yes, you can use other onions, but sweet onions like Vidalia provide the best flavor.
2. Is there a way to make this dish vegetarian?
Absolutely! This recipe is already vegetarian. Just skip any meat additions, and it will remain delicious as is.
3. Can I freeze leftovers?
Yes, you can freeze leftovers. Make sure to place them in a freezer-safe container. Thaw in the fridge before reheating.

Southern Sweet Onion Casserole
Ingredients
Method
- Preheat your oven to 350°F (175°C).
- In a large skillet, melt 4 tablespoons of butter over medium heat. Add the sliced onions, salt, pepper, and optional sugar. Cook until the onions are soft and lightly golden, about 15 minutes, stirring often.
- Remove the skillet from heat. Stir in the sour cream and beaten eggs until smooth. Fold in ½ cup of cheddar and ½ cup of mozzarella cheese.
- Transfer the onion mixture into a greased 9×13-inch baking dish. Sprinkle the remaining cheeses over the top.
- In a small bowl, mix the crushed crackers with the melted butter, then spread this mixture evenly over the casserole.
- Bake uncovered for 30–35 minutes, until the casserole is golden and bubbly.
- Let the casserole sit for 5 minutes before serving. Serve as a side with roasted meats, barbecue, or during holiday meals.