Sweet Onion Casserole – Melty, Cheesy, and Perfectly Golden!
This comforting dish brings out the best of sweet onions—caramelized, buttery, and smothered in a rich, cheesy cream sauce. It’s the kind of old-fashioned recipe you’ll find on grandma’s Sunday table, always baked to perfection and gone in minutes.
I remember my aunt bringing this to every holiday potluck. The first bite was always magic—velvety onions under that crispy, golden topping. It’s now one of my favorite make-ahead casseroles for family dinners and cozy evenings.
Ingredients:
- 4 large sweet onions, thinly sliced
- 2 tbsp butter
- 1½ cups shredded cheddar cheese
- 1 cup crushed buttery crackers (like Ritz)
- ½ cup sour cream
- ½ cup mayonnaise
- ½ tsp garlic powder
- ½ tsp salt
- ¼ tsp black pepper
Instructions:
- Preheat oven to 350°F (175°C). Grease a medium baking dish.
- In a large skillet, melt butter and sauté onions over medium heat until soft and lightly caramelized (about 12–15 minutes).
- In a mixing bowl, combine sour cream, mayonnaise, garlic powder, salt, pepper, and half of the cheese. Stir in cooked onions.
- Spread the mixture into the prepared baking dish. Top with remaining cheese and crushed crackers.
- Bake uncovered for 25–30 minutes, or until bubbly and golden on top.
- Let it cool for 5 minutes before serving.
Nutrition Facts (Per Serving – based on 6 servings)
| Calories | 290 kcal |
| Fat | 24 g |
| Carbohydrates | 11 g |
| Protein | 6 g |
| Sodium | 360 mg |
Printable Recipe Summary
| Sweet Onion Casserole | |
|---|---|
| Ingredients | Sweet onions, butter, cheddar cheese, crushed crackers, sour cream, mayonnaise, garlic powder, salt, pepper |
| Instructions | Caramelize onions, mix with creamy base, top with cheese and crackers, bake until golden. |
