Cheesy Au Gratin Potatoes – Best Thanksgiving Side

Every Thanksgiving, my family gathers around a table laden with turkey, stuffing, and all the trimmings. But the dish that always disappears first, the one that sparks the most passionate debates and the most fervent recipe requests, is my aunt's au gratin potatoes. They're not just any potatoes; they're a symphony of creamy, cheesy, buttery goodness, baked until the top is a glorious, golden crown.

This recipe is my heartfelt tribute to those cherished family gatherings. I've perfected the technique to ensure you get perfectly tender potatoes every time, enveloped in a luscious, velvety sauce that's infused with garlic and thyme. The secret lies in the layering and the careful balance of cheeses, creating a dish that's both comforting and elegant.

Whether you're a seasoned home cook or a first-time Thanksgiving host, this recipe will guide you to create potatoes so irresistible, they'll become your family's new tradition. Let's dive in and make some magic!

About the Ingredients

2 lbs (900g) Yukon Gold potatoes, peeled and thinly sliced (about 1/8-inch thick)

Yukon Golds hold their shape and have a buttery flavor. Russets will work too, but they may get softer. For even slices, use a mandoline.

2 cups (240g) sharp cheddar cheese, shredded

Sharp cheddar provides a bold, tangy flavor. For a milder taste, use medium cheddar or a mix of Gruyère and cheddar.

1 1/2 cups (180g) Gruyère cheese, shredded

Gruyère melts beautifully and adds nutty richness. Substitute with Swiss or Emmental if needed.

1 cup heavy cream

Heavy cream is essential for the rich, creamy sauce. You can replace half with whole milk for a lighter version, but it won't be as luxurious.

1 cup whole milk

Whole milk balances the richness. Use 2% if you prefer, but avoid skim for the best texture.

2 cloves garlic, minced

Fresh garlic is a must. If you're in a pinch, 1/2 teaspoon garlic powder can be used.

1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)

Thyme adds an earthy, aromatic note. Dried thyme works fine; just reduce the amount.

1 teaspoon salt

Adjust to your taste, but note that cheeses are salty, so don't overdo it.

1/2 teaspoon black pepper

Freshly ground pepper is best for flavor.

2 tablespoons unsalted butter, for greasing the dish

Butter prevents sticking and adds flavor. You can use cooking spray instead.

Tips & Tricks

• Slice the potatoes uniformly (about 1/8 inch thick) so they cook evenly. A mandoline makes this easy and safe.
• Don't skip the resting time after baking; it allows the sauce to set and makes serving cleaner.
• Use a combination of cheeses for the best flavor and meltability. Gruyère and cheddar are a classic duo.

Step-by-Step Instructions

1. Preheat and Prep

Preheat your oven to 375°F (190°C). Generously butter a 9×13-inch baking dish (or similar 3-quart casserole).

2. Layer the Potatoes

Arrange a single layer of potato slices in the bottom of the dish, slightly overlapping. Sprinkle with a bit of salt, pepper, and thyme.

3. Add Cheese and Repeat

Sprinkle about 1/3 of the cheddar and Gruyère over the potatoes. Repeat layering potatoes, seasonings, and cheese until you've used all ingredients, ending with a final layer of potatoes and reserving some cheese for the top.

4. Make the Cream Mixture

In a medium bowl, whisk together the heavy cream, milk, minced garlic, and the remaining salt and pepper.

5. Pour and Top

Pour the cream mixture evenly over the potatoes. Top with the remaining cheese.

6. Bake Covered

Cover the dish with foil and bake for 30 minutes. The potatoes should be almost tender when pierced with a fork.

7. Uncover and Brown

Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and the edges are bubbling. The internal temperature should reach 190°F (88°C).

8. Rest and Serve

Let the dish rest for 10-15 minutes before serving. This allows the sauce to set and makes for cleaner slices.

Delicious Variations

• Add a layer of caramelized onions or sautéed leeks for extra flavor.
• Swap the Gruyère for smoked gouda to add a smoky depth.
• Crumble cooked bacon over the top before baking for a savory crunch.

How to Store Cheesy Au Gratin Potatoes (The Best Thanksgiving Potatoes EVER!)

Frequently Asked Questions

I hope this recipe brings warmth and joy to your holiday table. If you try it, I'd love to hear how it turns out! Share your experience in the comments below, and don't forget to check out my other Thanksgiving favorites.

Cheesy Au Gratin Potatoes (The Best Thanksgiving Potatoes EVER!)

Cheesy Au Gratin Potatoes are ultra-creamy, golden, and perfect for Thanksgiving. A guaranteed holiday showstopper!

★★★★½ 4.8 (156 ratings)

20 minPrep time50 minCook time8Servings385 kcalCalories

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🧂 Ingredients

• 2 lbs (900g) Yukon Gold potatoes, peeled and thinly sliced (about 1/8-inch thick)
• 2 cups (240g) sharp cheddar cheese, shredded
• 1 1/2 cups (180g) Gruyère cheese, shredded
• 1 cup heavy cream
• 1 cup whole milk
• 2 cloves garlic, minced
• 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 2 tablespoons unsalted butter, for greasing the dish

📋 Instructions

1. 1Preheat and Prep — Preheat your oven to 375°F (190°C). Generously butter a 9×13-inch baking dish (or similar 3-quart casserole).
2. 2Layer the Potatoes — Arrange a single layer of potato slices in the bottom of the dish, slightly overlapping. Sprinkle with a bit of salt, pepper, and thyme.
3. 3Add Cheese and Repeat — Sprinkle about 1/3 of the cheddar and Gruyère over the potatoes. Repeat layering potatoes, seasonings, and cheese until you've used all ingredients, ending with a final layer of potatoes and reserving some cheese for the top.
4. 4Make the Cream Mixture — In a medium bowl, whisk together the heavy cream, milk, minced garlic, and the remaining salt and pepper.
5. 5Pour and Top — Pour the cream mixture evenly over the potatoes. Top with the remaining cheese.
6. 6Bake Covered — Cover the dish with foil and bake for 30 minutes. The potatoes should be almost tender when pierced with a fork.
7. 7Uncover and Brown — Remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and the edges are bubbling. The internal temperature should reach 190°F (88°C).
8. 8Rest and Serve — Let the dish rest for 10-15 minutes before serving. This allows the sauce to set and makes for cleaner slices.

👨‍🍳 Chef's Note: For the best results, use a good quality sharp cheddar and Gruyère. The flavor of the cheese really shines through.

Servings: 8

Cuisine: American

Course: Side Dish

Nutrition (per serving): 385 kcal · 14g protein · 22g carbs · 27g fat

Written by Aisha Hassan

Aisha writes about travel and cultural immersion, sharing stories and tips from her journeys to off-the-beaten-path destinations. She emphasizes respectful tourism, budget-friendly adventures, and the importance of connecting with local communities.