Devlin's Thanksgiving Onion Casserole

Devlin's Thanksgiving Onion Casserole is the ultimate comfort food side dish perfect for your holiday feast. This savory casserole features tender, caramelized yellow onions bathed in a creamy half-and-half sauce, layered with sharp cheddar cheese, and topped with a golden, buttery cracker crust for an irresistible crunch. With just 20 minutes of prep time, this easily assembled dish combines timeless flavors and textures to create a crowd-pleasing addition to your Thanksgiving table. Whether you're looking for a unique onion recipe or a melt-in-your-mouth cheesy casserole, this dish strikes the perfect balance of rich, creamy, and crispy—all baked to bubbling perfection!

Nutriscore Rating: 58/100

Prep Time:20 mins

Cook Time:40 mins

Total Time:60 mins

Servings: 8

Ingredients

• 6 large Yellow onions
• 4 tablespoons Salted butter
• 1 teaspoon Granulated sugar
• 2 tablespoons All-purpose flour
• 1.5 cups Half-and-half cream
• 0.5 teaspoons Salt
• 0.25 teaspoons Ground black pepper
• 2 cups Shredded sharp cheddar cheese
• 1 cup Crushed buttery crackers (like Ritz)
• 3 tablespoons Unsalted butter (melted)

Directions

Step 1

Preheat your oven to 350°F (175°C). Grease a 9x13-inch casserole dish and set aside.

Step 2

Peel the onions and slice them into thin rings, about 1/4-inch thick.

Step 3

In a large skillet, melt 4 tablespoons of salted butter over medium heat. Add the sliced onions and stir to coat them in the butter.

Step 4

Sprinkle 1 teaspoon of granulated sugar over the onions to help them caramelize. Cook the onions for 15-20 minutes, stirring occasionally, until they are golden brown and tender.

Step 5

Sprinkle the all-purpose flour over the caramelized onions and stir well to coat evenly. Cook for another 1-2 minutes to remove the raw flour taste.

Step 6

Gradually pour in the half-and-half cream while stirring constantly to avoid lumps. Cook for 2-3 minutes, or until the mixture thickens into a creamy sauce.

Step 7

Season the onion mixture with 1/2 teaspoon salt and 1/4 teaspoon ground black pepper. Taste and adjust seasoning if needed.

Step 8

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

Step 9

Sprinkle the shredded sharp cheddar cheese evenly over the top of the onion mixture.

Step 10

In a small bowl, combine the crushed buttery crackers with 3 tablespoons of melted unsalted butter. Mix until the crumbs are evenly coated.

Step 11

Sprinkle the buttery cracker mixture over the cheese layer, making sure it covers the entire casserole surface.

Step 12

Bake the casserole in the preheated oven for 20-25 minutes, or until the topping is golden brown and the edges are bubbling.

Step 13

Let the casserole cool for 5 minutes before serving. Enjoy this savory, cheesy onion casserole as a show-stopping Thanksgiving side dish!

Nutrition Facts

Serving size	(1723.1g)

Amount per serving	% Daily Value*
Calories	3109.5

Total Fat 225.0g	0%
Saturated Fat 133.6g	0%
Polyunsaturated Fat g
Cholesterol 599.1mg	0%
Sodium 4458.7mg	0%
Total Carbohydrate 199.6g	0%
Dietary Fiber 18.6g	0%
Total Sugars 63.6g
Protein 86.3g	0%

Vitamin D 28.4IU	0%
Calcium 2221.2mg	0%
Iron 6.7mg	0%
Potassium 1969.0mg	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: 63.9%

Protein: 10.9%

Carbs: 25.2%