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Southern Sweet Onion Casserole

A delightful casserole featuring sweet onions and creamy cheeses, perfect for family gatherings and holiday dinners.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 8 servings
Course: Casserole, Side Dish
Cuisine: Southern
Calories: 320
Ingredients Method Notes

Ingredients
  

Onion Mixture
  • 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)
Cheese and Egg Mixture
  • 1 cup shredded sharp cheddar cheese
  • ½ cup shredded mozzarella cheese
  • 1 cup sour cream
  • 2 large eggs (lightly beaten)
Topping
  • 1 cup crushed butter crackers (like Ritz)
  • 2 tablespoons melted butter (for topping)

Method
 

Preparation
  1. Preheat your oven to 350°F (175°C).
  2. 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 Filling
  1. 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 Casserole
  1. Transfer the onion mixture into a greased 9×13-inch baking dish. Sprinkle the remaining cheeses over the top.
  2. In a small bowl, mix the crushed crackers with the melted butter, then spread this mixture evenly over the casserole.
Bake
  1. Bake uncovered for 30–35 minutes, until the casserole is golden and bubbly.
Serve
  1. Let the casserole sit for 5 minutes before serving. Serve as a side with roasted meats, barbecue, or during holiday meals.

Notes

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. Adjust the amount of sugar based on how sweet your onions are. You can add cooked bacon or ham pieces for a meaty twist on this casserole or incorporate fresh herbs like thyme or rosemary for added flavor.