Christie's Baked Onion Casserole

Delight your taste buds with Christie's Baked Onion Casserole, a comforting and flavor-packed dish that transforms humble yellow onions into a bubbling, golden masterpiece. This casserole layers caramelized onions, enhanced with a touch of sugar for added sweetness, in a velvety cream sauce that's infused with butter, milk, and heavy cream. Topped with a savory mix of cheddar, Parmesan, breadcrumbs, and a dash of dried thyme, this dish bakes to perfection with a crispy, cheesy crust. Perfect as a crowd-pleasing side dish or a hearty vegetarian main course, this casserole is simple to prepare yet elegant enough for special occasions. With just 20 minutes of prep and a rich, creamy texture that’s irresistibly satisfying, Christie's Baked Onion Casserole is sure to become a family favorite.

Nutriscore Rating: 58/100

Prep Time:20 mins

Cook Time:55 mins

Total Time:75 mins

Servings: 6

Ingredients

• 6 medium Yellow onions
• 4 tablespoons Butter
• 1 teaspoon Salt
• 0.5 teaspoon Black pepper
• 2 teaspoons Granulated sugar
• 2 tablespoons All-purpose flour
• 1 cup Milk
• 0.5 cup Heavy cream
• 1 cup Shredded cheddar cheese
• 0.5 cup Grated Parmesan cheese
• 0.75 cup Breadcrumbs
• 0.5 teaspoon Dried thyme
• 1 tablespoon Olive oil

Directions

Step 1

Preheat your oven to 350°F (175°C) and grease a 9x9-inch casserole dish with non-stick spray or butter.

Step 2

Peel the onions and cut them into thin slices.

Step 3

In a large skillet over medium heat, melt the butter. Add the sliced onions, salt, and black pepper, stirring occasionally. Cook for about 20-25 minutes until the onions are caramelized and golden.

Step 4

Sprinkle the sugar over the onions and stir well for an additional 2 minutes to enhance their natural sweetness.

Step 5

Sprinkle the flour over the onions and stir until evenly coated. Gradually add the milk and heavy cream, stirring constantly to create a smooth, creamy sauce. Cook for another 2-3 minutes until the mixture thickens slightly, then remove from heat.

Step 6

Transfer the onion mixture into the prepared casserole dish, spreading it out evenly.

Step 7

In a small bowl, combine the cheddar cheese, Parmesan cheese, breadcrumbs, and dried thyme. Stir in the olive oil until the mixture is crumbly and evenly coated.

Step 8

Sprinkle the breadcrumb topping evenly over the onions in the casserole dish.

Step 9

Bake in the preheated oven for 25–30 minutes, or until the topping is golden brown and the casserole is bubbling around the edges.

Step 10

Allow the casserole to rest for 5-10 minutes before serving. Enjoy as a comforting side or a hearty vegetarian main dish!

Nutrition Facts

Serving size	(1356.8g)

Amount per serving	% Daily Value*
Calories	2337.6

Total Fat 158.6g	0%
Saturated Fat 88.1g	0%
Polyunsaturated Fat 2.9g
Cholesterol 434.6mg	0%
Sodium 5488.8mg	0%
Total Carbohydrate 161.2g	0%
Dietary Fiber 15.1g	0%
Total Sugars 54.5g
Protein 73.0g	0%

Vitamin D 116.3IU	0%
Calcium 1752.1mg	0%
Iron 6.2mg	0%
Potassium 1394.8mg	0%

*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: 60.4%

Protein: 12.4%

Carbs: 27.3%