Description
This Tennessee Onion Casserole is pure Southern comfort — sweet Vidalia onions layered with gooey cheese, baked in a creamy, buttery sauce until perfectly caramelized on top. It’s an easy side dish that pairs beautifully with grilled meats, holiday roasts, or potluck favorites.
Ingredients
Scale
- 3 large Vidalia or sweet onions, sliced into ¼-inch rounds
- 2 tbsp unsalted butter
- ½ cup mayonnaise
- ½ cup sour cream
- 1 cup shredded mozzarella cheese
- 1 cup shredded sharp cheddar cheese
- ½ tsp garlic powder
- ½ tsp salt
- ¼ tsp black pepper
- ½ cup crushed buttery crackers (like Ritz)
- 1 tbsp melted butter (for topping)
Instructions
- Preheat the oven
- Preheat to 375°F (190°C). Lightly butter a 9×9-inch baking dish.
- Sauté the onions
- In a skillet, melt 2 tbsp butter over medium heat.
- Add onion slices and cook until softened and lightly golden, about 10 minutes.
- Make the creamy cheese mix
- In a bowl, combine mayonnaise, sour cream, mozzarella, cheddar, garlic powder, salt, and pepper.
- Assemble the casserole
- Spread cooked onions evenly into the prepared baking dish.
- Pour the cheese mixture over the onions and spread evenly.
- Add topping and bake
- Mix crushed crackers with 1 tbsp melted butter and sprinkle on top.
- Bake for 25 minutes, or until bubbly and golden brown on top.
- Serve hot
- Let rest for 5 minutes before serving.
- Prep Time: PT10M
- Cook Time: PT35M
- Category: Main Dish
- Method: Baked
- Cuisine: American
Nutrition
- Serving Size: About ¾ cup
- Calories: 320 kcal
- Sugar: 5g
- Sodium: 460mg
- Fat: 28g
- Saturated Fat: 15g
- Unsaturated Fat: 11g
- Trans Fat: 0g
- Carbohydrates: 10g
- Fiber: 1g
- Protein: 7g
- Cholesterol: 70mg