Easy Southern Sweet Onion Casserole is the best vegetable side dish ever! Caramelized sweet onions, Vidalia if you can find them, are meltingly tender and paired with buttery, crunchy Ritz crackers, sour cream, and cheese; this decadent onion casserole literally melts in your mouth!
I have not always been a fan of onions and, to this day, still, I wouldn’t say I like raw onions. But, I do love the flavor cooked onions give dishes, and fried onion rings, well let’s say they are a guilty pleasure. But this delicious casserole made a believer out of me, and if you make it, I predict it will you too!
Here’s what you will need:
You will need the following ingredients: sweet onions (Vidalia, if you can find them), sour cream, butter, Ritz crackers, Parmesan cheese, and a Mexican or Italian blend of grated cheese. (The Mexican Blend I used included Monterey Jack, Cheddar, Asadero, and Quesadilla cheeses.)
Here’s how to make it:
Preheat the oven to 350 degrees F.
Add butter to a large skillet over medium heat. When the butter has melted, add the onions.
Reduce the heat to low and cook the onions for about 30 minutes, stirring occasionally.
Place half of the onions in a small casserole dish, which has been greased or sprayed with non-stick cooking spray.
Add half the sour cream and spread out evenly.
Sprinkle half the Mexican grated cheese evenly over the top.
Top with half of the Parmesan cheese and half of the Ritz cracker crumbs.
Repeat the layers ending with a layer of Ritz cracker crumbs.
Bake uncovered for 25 or 30 minutes or until the mixture is bubbly and the topping is golden brown.
Related Recipes:
If you like this vegetable casserole, you might also like these popular make-ahead favorites: Broccoli Cheese Casserole, Southern Squash Casserole, Baked Mushroom Casserole, Cauliflower Cheese Bake, Baked Tomato Casserole, and Southern Sweet Potato Casserole.
If you need more menu ideas, check out all of my side dish recipes here.
★ If you make this recipe, please leave a comment and give this recipe a star rating. I would love to know how you liked it!
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Southern Sweet Onion Casserole Recipe
Ingredients
- 3 large sweet onions peeled and thinly sliced (Vidalia, if you can find them)
- 1/2 cup unsalted butter
- 1/2 cup sour cream
- 1/2 cup grated Mexican cheese blend
- 1/2 cup Parmesan cheese
- 1 cup Ritz crackers crushed (about 24 crackers)
Instructions
- Preheat the oven to 350 degrees F.
- Add butter to a large skillet over medium heat. When the butter has melted, add the onions.
- Reduce the heat to low and cook the onions for about 30 minutes, stirring occasionally.
- Place half of the onions in a small casserole dish, which has been greased or sprayed with non-stick cooking spray.
- Add half the sour cream and spread out evenly.
- Sprinkle half the Mexican grated cheese evenly over the top.
- Top with half of the Parmesan cheese and half of the Ritz cracker crumbs.
- Repeat the layers ending with a layer of Ritz cracker crumbs.
- Bake uncovered for 25 or 30 minutes or until the mixture is bubbly and the topping is golden brown.
It is incredible! I used some bacon fat instead of the butter and also had some crisp bacon crumbles as well. It was to die for! I garnished with some chopped green onions for “pretty”. Was a bit hit too.
This was easy and delicious!
Very good recipe! I just tweeked the recipe a little by mixing cheese and sour cream into the onions and added a little salt, pepper and garlic powder. This is going to be a hit this Thanksgiving.
Hi Karen, sounds delicious! I hope you enjoy and Happy Thanksgiving!
Sharon
Can this dish be made ahead and frozen?
Hi Jane, I have never frozen it so I can’t say for sure, but I think it would work. I have made it early in the day, refrigerated it, and then baked it later that evening.
If you decide to freeze it, please let me know how it does!
All my best,
Sharon
Not a good idea – the sour cream breaks down.