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Delicious Southern Sweet Onion Casserole topped with golden breadcrumbs

Southern Sweet Onion Casserole

A delicious, comforting dish with layers of tender onions and a creamy, cheesy mixture, perfect for family gatherings and potlucks.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 8 servings
Course: Main Course, Side Dish
Cuisine: Comfort Food, Southern
Calories: 380
Ingredients Method Notes

Ingredients
  

Main Ingredients
  • 4 large sweet onions (Vidalia or similar), sliced into thick rings Use sweet onions for best flavor.
  • 3 tbsp unsalted butter For sautéing onions.
  • 1 tbsp olive oil For sautéing onions.
  • 1 cup sour cream
  • 1/2 cup mayonnaise
  • 1 cup shredded cheddar cheese Plus extra for topping if desired.
  • 1/2 cup grated Parmesan cheese
  • 1 tsp garlic powder
  • 1/2 tsp black pepper
  • 1/2 tsp salt Adjust to taste.
  • 1/2 tsp smoked paprika Optional for added flavor.
  • 1 cup crushed buttery crackers or panko breadcrumbs
  • 2 tbsp melted butter For mixing with the breadcrumbs.
  • 1/4 cup shredded cheddar cheese Optional for topping.

Method
 

Preparation
  1. Preheat oven to 180°C (350°F) and lightly grease a medium baking dish.
  2. In a large skillet, melt butter with olive oil over medium heat.
  3. Add sliced onions and cook for 10–12 minutes, stirring occasionally, until soft and lightly caramelized. Remove from heat.
  4. In a bowl, combine sour cream, mayonnaise, cheddar cheese, Parmesan, garlic powder, salt, black pepper, and smoked paprika.
  5. Fold the cooked onions into the creamy mixture until fully coated.
  6. Spread the mixture evenly into the prepared baking dish.
  7. Mix crushed crackers with melted butter and sprinkle evenly over the casserole. Add extra cheese if desired.
Baking
  1. Bake for 40–45 minutes, until golden on top and bubbling at the edges.
  2. Let it sit for 5–10 minutes before serving so it sets slightly.

Notes

Use fresh, high-quality ingredients for the best flavor. Don’t rush the caramelization of the onions; it adds sweetness and depth to the dish. Feel free to add vegetables like bell peppers or spinach for added nutrition and flavor.