Walla Walla Sweet Onion Swiss Cheese Casserole
Indulge in the comforting flavors of Walla Walla Sweet Onion Swiss Cheese Casserole, a rich and savory side dish that celebrates the natural sweetness of caramelized Walla Walla onions. Perfect for holiday gatherings or weeknight dinners, this casserole features layers of tender onions blanketed in a creamy Swiss cheese sauce and topped with a golden, buttery panko breadcrumb crust. With hints of parmesan, garlic, and fresh parsley adding depth, this recipe creates an irresistible medley of flavors and textures. Easy to prepare and bursting with cheesy goodness, this dish pairs beautifully with roasted meats, hearty vegetables, or fresh salads. Treat your taste buds to this warm, decadent bake—it’s comfort food at its finest!
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Recipe Information
Ingredients
- 3 large Walla Walla sweet onions
- 4 tablespoons unsalted butter
- 3 tablespoons all-purpose flour
- 2 cups whole milk
- 0.5 cups heavy cream
- 2 cups shredded Swiss cheese
- 0.5 cups parmesan cheese
- 1 cup panko breadcrumbs
- 2 tablespoons olive oil
- 1 teaspoon kosher salt
- 0.5 teaspoons black pepper
- 0.5 teaspoons garlic powder
- 2 tablespoons fresh parsley
Instructions
Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish and set aside.
Peel and thinly slice the Walla Walla sweet onions into half-moon shapes.
In a large skillet, melt 2 tablespoons of butter over medium heat. Add the onions and sauté until caramelized, about 10-12 minutes. Stir occasionally to prevent burning.
While the onions cook, prepare the sauce. In a medium saucepan, melt the remaining 2 tablespoons of butter over medium heat. Whisk in the flour and cook for 1-2 minutes, stirring constantly, to form a roux.
Gradually add the milk and heavy cream to the roux, whisking constantly to ensure a smooth sauce. Cook until the mixture thickens, about 3-5 minutes.
Remove the sauce from heat and stir in 1.5 cups of Swiss cheese, 0.25 cups of parmesan cheese, salt, pepper, and garlic powder. Mix until the cheese is fully melted and incorporated.
Spread the caramelized onions evenly in the prepared baking dish. Pour the cheese sauce over the onions, spreading it out with a spatula to cover evenly.
In a small bowl, combine the panko breadcrumbs with the olive oil, remaining 0.5 cups of Swiss cheese, 0.25 cups of parmesan cheese, and parsley. Sprinkle this mixture evenly over the top of the casserole.
Bake the casserole in the preheated oven for 25-30 minutes, or until the top is golden brown and bubbling.
Remove from the oven and let cool for 5 minutes before serving.
Garnish with additional fresh parsley if desired.
Nutrition Facts
Calories |
2916 | ||
|---|---|---|---|
% Daily Value* |
|||
| Total Fat | 220.7 g | 283% | |
| Saturated Fat | 114.4 g | 572% | |
| Polyunsaturated Fat | 3.2 g | ||
| Cholesterol | 587 mg | 196% | |
| Sodium | 1989 mg | 86% | |
| Total Carbohydrate | 136.8 g | 50% | |
| Dietary Fiber | 10.3 g | 37% | |
| Total Sugars | 57.2 g | ||
| Protein | 111.9 g | 224% | |
| Vitamin D | 6.6 mcg | 33% | |
| Calcium | 3218 mg | 248% | |
| Iron | 6.9 mg | 38% | |
| Potassium | 1895 mg | 40% | |
*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.
