Cheddar and Caramelized Onion Au Gratin Potatoes

Recipe Collection: Dinner

Cheddar and Caramelized Onion Au Gratin Potatoes bring the rich flavors of a vegetarian French classic to your table, perfect for any occasion. This dish features tender, thinly sliced russet potatoes enveloped in a luscious cheese sauce, complemented by the sweetness of caramelized onions. Ideal for family dinners or special gatherings, these au gratin potatoes are gluten and dairy-rich, making them a comforting side dish.

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Overview

Indulge in the ultimate comfort food with these creamy cheddar au gratin potatoes, elevated with the rich sweetness of caramelized onions. This dish combines tender, thinly sliced potatoes with a luscious cheese sauce, creating a perfect side for any special occasion or a cozy family dinner. The addition of caramelized onions adds depth and a hint of sweetness, making this a guaranteed 5-star dish.

Diet Type

Vegetarian

Allergies

Dairy, Gluten

Cuisine

French

Serving Size: 4

Cooking Time: 120 minutes

Ingredients

• 4 Medium russet potatoes, sliced
• 1 Medium Vidalia onion, sliced
• 1 Teaspoon (tsp) salt, divided
• 0.5 Teaspoon (tsp) black pepper, ground
• 3 Tablespoons (tbsp) unsalted butter
• 3 Tablespoons (tbsp) all-purpose flour
• 2 Cups whole milk
• 1.5 Cups Cheddar cheese, shredded
• 0.5 Teaspoon (tsp) garlic powder
• 0.5 Teaspoon (tsp) dry mustard
• 0.5 Teaspoon (tsp) Cajun seasoning
• 2 Tablespoons (tbsp) fresh parsley, minced
• 0.5 Cup Parmesan cheese, grated

Steps

1. Preheat your oven to 375°F (190°C). Butter a 2-quart casserole dish and set aside.
2. In a skillet over medium heat, melt 1 tablespoon of butter. Add the onion rings and a pinch of salt. Cook, stirring occasionally, until the onions are golden brown and caramelized, about 15 minutes. Set aside.
3. Layer half of the sliced potatoes in the bottom of the prepared casserole dish. Season with 0.5 teaspoon of salt and 0.25 teaspoon of pepper. Spread the caramelized onions over the potatoes, then layer the remaining potatoes on top. Season again with the remaining salt and pepper.
4. In a medium saucepan, melt the remaining 2 tablespoons of butter over medium heat. Whisk in the flour, garlic powder, dry mustard, and Cajun seasoning. Cook for about 1 minute until the mixture is golden and fragrant.
5. Gradually whisk in the milk, about 0.25 cup at a time, ensuring a smooth consistency. Continue to cook, whisking constantly, until the sauce thickens, about 3-5 minutes.
6. Remove the saucepan from heat and stir in the Cheddar cheese until melted and smooth. Adjust seasoning if necessary.
7. Pour the cheese sauce evenly over the layered potatoes and onions. Sprinkle the top with grated Parmesan cheese.
8. Cover the dish with aluminum foil and bake in the preheated oven for 1 hour. Remove the foil and bake for an additional 30 minutes, or until the top is golden brown and the potatoes are tender.
9. Remove from the oven and let it cool slightly. Garnish with chopped fresh parsley before serving.

Enjoy your homemade Cheddar and Caramelized Onion Au Gratin Potatoes!