Golden Onion Casserole

Transform simple ingredients into a decadent dish with this Golden Onion Casserole, a must-try side dish that celebrates the natural sweetness of caramelized yellow onions. Slowly cooked to a golden perfection, the onions are bathed in a creamy Gruyère sauce and topped with a crunchy panko-Parmesan crust for a luscious, savory combination that's pure comfort food. With hints of garlic and thyme adding aromatic depth, this casserole is baked to bubbly, golden-brown bliss. Perfect as an indulgent accompaniment to roasted meats or a standalone vegetarian delight, it’s an elevated yet approachable recipe that comes together in just over an hour. Serve it warm and garnish with fresh parsley for a dish that’s sure to steal the spotlight at your next dinner table!

Nutriscore Rating: 53/100

Prep Time:15 mins

Cook Time:50 mins

Total Time:65 mins

Servings: 6

Ingredients

• 4 large Yellow onions
• 4 tablespoons Butter
• 2 tablespoons Olive oil
• 2 cloves Garlic
• 1 teaspoon Dried thyme
• 1 teaspoon Salt
• 0.5 teaspoon Ground black pepper
• 1 cup Heavy cream
• 1 cup Chicken or vegetable broth
• 1.5 cups Shredded Gruyère cheese
• 1 cup Panko breadcrumbs
• 0.5 cup Parmesan cheese
• 2 tablespoons Fresh parsley

Directions

Step 1

Preheat the oven to 375°F (190°C). Lightly grease a medium-sized casserole dish and set aside.

Step 2

Peel the yellow onions and slice them thinly into half-moons.

Step 3

Heat a large skillet over medium heat and add the butter and olive oil. Once melted and hot, add the sliced onions.

Step 4

Cook the onions, stirring occasionally, for 20–25 minutes until they caramelize to a golden brown color. Reduce the heat if they begin to burn.

Step 5

Mince the garlic and add it to the skillet with the onions, along with the dried thyme, salt, and black pepper. Cook for an additional 2 minutes until fragrant.

Step 6

Pour in the heavy cream and chicken or vegetable broth. Stir to combine and bring to a gentle simmer for 3–4 minutes.

Step 7

Remove the skillet from heat and stir in 1 cup of shredded Gruyère cheese. Mix until the cheese melts into a creamy sauce.

Step 8

Transfer the onion mixture into the prepared casserole dish and spread it out evenly.

Step 9

In a small bowl, combine the panko breadcrumbs, Parmesan cheese, and remaining 0.5 cup of Gruyère cheese. Sprinkle this topping evenly over the onions in the casserole dish.

Step 10

Place the casserole in the preheated oven and bake for 20–25 minutes, or until the topping is golden and crispy.

Step 11

Remove from the oven and let cool slightly before garnishing with fresh chopped parsley.

Step 12

Serve warm as a side dish or main course, and enjoy the rich, cheesy, and flavorful Golden Onion Casserole!

Nutrition Facts

Serving size	1453.4 grams (1453.4g)

Amount per serving	% Daily Value*
Calories	2793

Total Fat 225.40g	289%
Saturated Fat 123.20g	616%
Polyunsaturated Fat 4.10g
Cholesterol 596mg	199%
Sodium 5483mg	238%
Total Carbohydrate 102.50g	37%
Dietary Fiber 13.20g	47%
Total Sugars 30.20g
Protein 80.50g	161%

Vitamin D 45IU	225%
Calcium 2145mg	165%
Iron 5mg	29%
Potassium 1162mg	25%

*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.

Source of Calories

Fat: 73.5%

Protein: 11.7%

Carbs: 14.9%