Cheesy Onion Bake
Elevate your comfort food game with this irresistible Cheesy Onion Bake, a decadent side dish brimming with rich, savory flavors. Sweet, caramelized yellow onions are coated in a creamy, cheese-laden sauce made with sharp cheddar and nutty parmesan, then finished with a golden, crispy panko breadcrumb topping. Perfect for family dinners, holiday gatherings, or potlucks, this easy-to-make recipe combines a handful of pantry staples with minimal prep time for maximum flavor. Serve it fresh from the oven with a sprinkle of parsley for a touch of freshness, and watch it disappear from the table! Whether you're looking for a crowd-pleaser or a cozy addition to your weeknight rotation, this baked onion casserole is sure to become a household favorite.
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Recipe Information
Ingredients
- 3 tablespoons butter
- 4 large yellow onions
- 1 teaspoon sugar
- 1 teaspoon salt
- 0.5 teaspoon black pepper
- 0.5 teaspoon garlic powder
- 2 tablespoons all-purpose flour
- 1.5 cups whole milk
- 2 cups cheddar cheese, shredded
- 0.5 cups parmesan cheese, grated
- 0.5 cups panko breadcrumbs
- 1 tablespoon olive oil
- 2 tablespoons fresh parsley, chopped (optional)
Instructions
Preheat your oven to 375°F (190°C) and grease a 9x9-inch baking dish.
Peel and thinly slice the yellow onions into rings or half-moons.
In a large skillet over medium heat, melt the butter. Add the onions, sugar, salt, and black pepper. Cook, stirring occasionally, for 15 to 20 minutes until the onions are golden and caramelized.
Sprinkle the garlic powder and flour evenly over the caramelized onions. Stir well to combine and cook for 1 to 2 minutes to remove the raw flour taste.
Gradually pour in the milk, stirring constantly, until the mixture thickens into a creamy sauce. Remove the skillet from the heat.
Stir in 1 1/2 cups of cheddar cheese and 1/4 cup of parmesan cheese, mixing until the cheeses melt into the sauce.
Transfer the onion mixture to the prepared baking dish, spreading it out evenly.
In a small bowl, mix the remaining 1/2 cup of cheddar cheese, 1/4 cup of parmesan cheese, panko breadcrumbs, and olive oil. Sprinkle this topping evenly over the onion mixture.
Bake in the preheated oven for 20 to 25 minutes, or until the topping is golden brown and bubbling.
Remove the dish from the oven and let it cool slightly. Garnish with chopped parsley, if desired, before serving.
Nutrition Facts
Calories |
2120 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 145.9 g | 187% | |
| Saturated Fat | 84.4 g | 422% | |
| Polyunsaturated Fat | 2.8 g | ||
| Cholesterol | 423 mg | 141% | |
| Sodium | 5033 mg | 219% | |
| Total Carbohydrate | 119.0 g | 43% | |
| Dietary Fiber | 12.2 g | 44% | |
| Total Sugars | 49.6 g | ||
| Protein | 96.5 g | 193% | |
| Vitamin D | 5.4 mcg | 27% | |
| Calcium | 2647 mg | 204% | |
| Iron | 5.1 mg | 28% | |
| Potassium | 1745 mg | 37% | |
*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
