Au Gratin Potatoes

Au Gratin Potatoes, also known as Gratin Dauphinois, is the ultimate comfort food side dish. Thinly sliced Yukon gold potatoes are layered in a rich and creamy cheese sauce, then baked until golden, bubbly, and beautifully tender. With its luxurious texture and irresistible cheesy flavor, this classic dish is perfect for holidays, dinner parties, or a cozy night in.

Why You’ll Love This Recipe

This recipe is both elegant and satisfying. The combination of Gruyère cheese, heavy cream, and tender potatoes delivers a velvety, melt-in-your-mouth experience. It’s easy to prepare with basic ingredients, and the layered presentation makes it look as impressive as it tastes. Best of all, it feeds a crowd and pairs perfectly with roasted meats, poultry, or even as a stand-alone vegetarian main dish.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• 5 tablespoons unsalted butter, divided

• ¼ cup all-purpose flour

• 2½ cups milk (any kind)

• ½ cup heavy whipping cream

• 1¼ teaspoons fine sea salt (or to taste)

• ¼ teaspoon freshly ground black pepper

• 1 teaspoon onion powder

• ½ teaspoon garlic powder

• 2 cups grated Gruyère cheese or white cheddar, divided

• 3 pounds Yukon gold potatoes, scrubbed (peeled or unpeeled)

• Chives, for garnish (optional)

Directions

1. Preheat Oven:
   Preheat oven to 350°F (175°C). Use 1 tablespoon of butter to grease a 9×13-inch (3-quart) casserole dish.

2. Make the Cheese Sauce:
   In a large pot or Dutch oven over medium heat, melt the remaining 4 tablespoons of butter. Whisk in the flour and cook for 2 minutes to eliminate the raw taste.
   Gradually whisk in the milk, followed by the cream. Add salt, pepper, onion powder, and garlic powder. Continue whisking until the sauce thickens.
   Remove from heat and stir in half of the shredded cheese until melted and smooth.

3. Slice the Potatoes:
   Peel the potatoes if desired. Slice them into ⅛-inch thick rounds using a food processor or mandolin for even thickness.

4. Combine and Assemble:
   Add the sliced potatoes to the cheese sauce and gently stir to coat. Spread the mixture evenly in the prepared casserole dish.
   Sprinkle the remaining cheese over the top.

5. Bake:
   Cover with aluminum foil and bake for 60 minutes. Remove the foil and bake for an additional 15–30 minutes, or until the top is golden and the potatoes are tender when pierced with a fork.
   For extra browning, broil for 1–2 minutes at the end—but watch closely to prevent burning.

6. Rest and Serve:
   Let the dish rest for 15 minutes before serving. Garnish with chopped chives and freshly cracked black pepper if desired.

Servings and timing

Servings: 12
Prep time: 20 minutes
Cook time: 1 hour 30 minutes
Total time: 1 hour 50 minutes

Variations

• Add Protein: Mix in shredded chicken for a heartier version.

• Cheese Swap: Try sharp cheddar, Parmesan, or a blend of cheeses for a different flavor profile.

• Herb Infusion: Add thyme, rosemary, or a bay leaf to the cream while cooking for extra depth.

• Spicy Twist: Add a pinch of cayenne pepper or sliced jalapeños for a mild kick.

• Vegan Version: Use plant-based butter, non-dairy milk, and vegan cheese alternatives.

Storage/Reheating

Store leftovers in an airtight container in the refrigerator for up to 4 days.
To reheat, cover with foil and bake at 350°F (175°C) until warmed through (about 20 minutes), or microwave individual portions for 1–2 minutes.
You can also freeze the fully baked dish for up to 2 months. Thaw overnight in the refrigerator and reheat as above.

FAQs

Can I make Au Gratin Potatoes ahead of time?

Yes, you can assemble the dish a day ahead, cover, and refrigerate. Bake just before serving, adding extra time as needed since it will be cold.

What’s the best potato for Au Gratin?

Yukon golds are ideal because they hold their shape and have a creamy texture. Russets work too but may break down more.

Can I use pre-shredded cheese?

Pre-shredded cheese contains anti-caking agents that may affect the sauce texture. For best results, grate cheese from a block.

Why is my sauce runny?

Ensure you cook the flour long enough and allow the sauce to thicken before adding potatoes. Also, let the dish rest before serving to set.

Can I skip the flour?

The flour helps thicken the sauce. For a gluten-free version, use a 1:1 gluten-free flour blend or cornstarch.

Should I peel the potatoes?

Peeling is optional. Leaving the skin on adds texture and nutrients, but peeling gives a more classic, smooth presentation.

How do I make it cheesier?

Add more cheese into the sauce or sprinkle an extra handful over the top before baking.

Can I add breadcrumbs on top?

Yes, mix breadcrumbs with melted butter and a bit of cheese, then sprinkle on top before the final bake for a crispy topping.

Can I cook this in a slow cooker?

You can, though the texture may differ. Cook on low for 6–7 hours or until the potatoes are tender.

What’s the difference between Au Gratin and Scalloped Potatoes?

Au Gratin includes cheese, while scalloped potatoes are typically made with just cream or milk without cheese.

Conclusion

Au Gratin Potatoes are a luxurious, creamy, and cheesy side dish that transforms humble potatoes into something truly special. Whether you’re hosting a holiday meal or just want a comforting side to accompany dinner, this recipe delivers rich flavor and satisfying texture every time. Once you try it, it’ll become a go-to favorite for all your gatherings.

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