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The Ultimate Potatoes Au Gratin Recipe: Creamy, Cheesy, and Irresistible

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Introduction

Potatoes Au Gratin is the ultimate comfort food—a rich, creamy, and cheesy dish that is both elegant and satisfying. Whether you’re preparing a family dinner, hosting a holiday feast, or simply craving a cozy side dish, this recipe is the perfect addition to any meal. With layers of tender potatoes, a creamy cheese sauce, and a golden-brown crust, it’s a dish that will have everyone coming back for seconds!

In this post, we’ll break down the best way to make Potatoes Au Gratin, including tips, variations, equipment needed, storage instructions, and perfect pairings. Let’s get started!

Table of Contents

  1. What Are Potatoes Au Gratin?
  2. Why You’ll Love This Recipe
  3. Ingredients You’ll Need
  4. Kitchen Equipment Required
  5. Step-by-Step Instructions
  6. Pro Tips for the Best Potatoes Au Gratin
  7. Variations and Substitutions
  8. How to Store and Reheat Leftovers
  9. Perfect Pairings: What to Serve with Potatoes Au Gratin
  10. Frequently Asked Questions (FAQ)

What Are Potatoes Au Gratin?

Potatoes Au Gratin is a classic French dish featuring thinly sliced potatoes baked in a creamy cheese sauce until perfectly golden and bubbly. Unlike scalloped potatoes, which are typically made with a milk or cream-based sauce without cheese, Potatoes Au Gratin takes it up a notch with a generous amount of melted cheese.

Why You’ll Love This Recipe

  • Rich and Creamy – Every bite is packed with cheesy, buttery goodness.
  • Simple Yet Elegant – Ideal for weeknight dinners or fancy holiday gatherings.
  • Customizable – Easily tweak the recipe with different cheeses, add-ins, or toppings.
  • Make-Ahead Friendly – Prepare in advance and bake when needed!

Ingredients You’ll Need

For the Potatoes:

  • 2 ½ pounds red potatoes (sliced into ⅛-inch rounds)
  • 1 onion (thinly sliced)
  • ¾ teaspoon salt (divided)
  • ½ teaspoon black pepper (divided)

For the Cheese Sauce:

  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 1 teaspoon dry mustard powder
  • 2 cups milk
  • 1 cup shredded cheddar cheese
  • ½ cup shredded Gruyere cheese

Kitchen Equipment Required

To prepare the best Potatoes Au Gratin, you’ll need:

  • Cutting board & sharp knife – For slicing potatoes and onions.
  • Mandoline slicer (optional) – Ensures even, thin potato slices.
  • Saucepan – For making the cheese sauce.
  • Whisk – Helps prevent lumps in the sauce.
  • 2.5 to 3-quart casserole dish – To bake the gratin to perfection.
  • Foil – Prevents over-browning during baking.

Step-by-Step Instructions

1. Prepare the Potatoes and Onion

  • Preheat oven to 400°F (200°C).
  • Wash and thinly slice the red potatoes (about ⅛-inch thick).
  • Thinly slice the onion.
  • Toss the potatoes and onions in a large bowl with ½ teaspoon salt and ¼ teaspoon black pepper.
  • Arrange the potato and onion slices upright in a greased casserole dish.

2. Make the Cheese Sauce

  • Melt butter in a saucepan over medium heat.
  • Stir in flour and cook for 2-3 minutes, whisking continuously.
  • Add dry mustard powder, remaining salt & pepper, and milk. Continue whisking until thick and bubbly.
  • Remove from heat and stir in cheddar and Gruyere cheese until smooth.

3. Assemble and Bake

  • Pour the cheese sauce evenly over the potatoes, ensuring full coverage.
  • Cover the dish with foil (sprayed with cooking spray to prevent sticking).
  • Bake for 60 minutes.
  • Remove the foil and bake an additional 20-30 minutes until golden brown and tender.
  • Let rest for 15 minutes before serving.

Pro Tips for the Best Potatoes Au Gratin

  • Use a Mandoline – Ensures uniform slices for even cooking.
  • Shred Your Own Cheese – Pre-shredded cheese contains anti-caking agents that affect melting.
  • Let It Rest – Cooling for 15 minutes prevents a soupy texture.
  • Make Ahead – Assemble up to 24 hours in advance and refrigerate before baking.

Variations and Substitutions

  • Different Cheeses: Try Parmesan, Swiss, or Fontina for a twist.
  • Garlic Lovers: Add minced garlic to the cheese sauce.
  • Meaty Upgrade: Layer in cooked bacon or ham.
  • Gluten-Free: Use cornstarch instead of flour to thicken the sauce.

How to Store and Reheat Leftovers

  • Refrigerate: Store in an airtight container for up to 4 days.
  • Reheat: Warm in a 350°F oven for 15-20 minutes, or microwave individual portions.
  • Freeze: Wrap tightly and freeze for up to 2 months. Thaw overnight before reheating.

Perfect Pairings: What to Serve with Potatoes Au Gratin

  • Protein Pairings: Roasted chicken, steak, or baked salmon.
  • Vegetable Sides: Roasted Brussels sprouts, green beans, or a fresh salad.
  • Wine Pairing: A Chardonnay or Pinot Noir complements the rich flavors beautifully.

Frequently Asked Questions (FAQ)

1. Can I use a different type of potato?

Yes! Yukon Gold or Russet potatoes work well, though Russets may release more starch, altering the texture.

2. How do I prevent the sauce from curdling?

Avoid overheating the milk and add cheese off the heat for a smooth, creamy sauce.

3. Can I make this dish in advance?

Absolutely! Assemble the dish up to 24 hours ahead, store in the fridge, then bake when ready.

4. What can I use instead of Gruyere cheese?

Swiss, Fontina, or Monterey Jack make excellent substitutes.

5. Can I add breadcrumbs on top?

Yes! A sprinkle of buttered breadcrumbs or panko adds a delightful crunch.

Conclusion

Potatoes Au Gratin is a timeless classic that never fails to impress. Whether you’re preparing it for a holiday gathering or a simple weeknight dinner, this rich and creamy dish will become a staple in your kitchen. Try out this recipe, experiment with variations, and enjoy every cheesy bite!

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