Dad’s Cheesy Au Gratin Potatoes Recipe

Dad’s Creamy & Cheesy Au Gratin Potatoes are pure comfort in a dish. They’ve been a go-to in my family for years, especially when we’re entertaining or just need a side that feels special and indulgent. What sets these potatoes apart is the incredibly rich and creamy sauce, made with a simple roux and plenty of good cheese. And the secret to their amazing texture? Slicing the Yukon Gold potatoes super thin – about 1/8th of an inch. This ensures they cook evenly and absorb all that wonderful sauce, becoming tender without turning to mush. The thinly sliced yellow onion tucked in there adds a whisper of sweetness that just makes everything better. These aren’t just any potatoes; they’re a hug on a plate, perfect for holidays or any night you want to impress without fuss.

Ingredients:

• 2 ½ pounds Yukon gold potatoes (about 6 to 7 medium potatoes), peeled and sliced into ⅛-inch-thick rounds
• ½ medium yellow onion, thinly sliced
• 3 tablespoons salted butter
• ¼ cup all-purpose flour
• 1 ½ cups whole milk or unsweetened almond milk
• 8 ounces sharp Cheddar cheese (about 2 cups), shredded
• ¾ teaspoon kosher salt, plus more to taste
• ½ teaspoon garlic powder
• Freshly ground black pepper
• 2 ounces shredded Gruyere cheese (about ½ cup)
• 2 ounces grated Parmesan cheese (about ½ cup)
• Chopped fresh chives or parsley, for garnish

Dad’s Creamy & Cheesy Au Gratin Potatoes

These potatoes are a staple in my family, especially when we have company or want a truly comforting side dish. The secret to their incredible creaminess and cheesy flavor lies in the sauce and the way the potatoes are sliced. Yukon Golds are fantastic here because they hold their shape well even after baking and have a lovely, buttery texture that complements the rich sauce. Don’t skip slicing them thinly – about ⅛-inch is perfect. If you don’t have a mandoline, a sharp knife and a steady hand will do, just try to keep them as uniform as possible for even cooking. The thinly sliced onion adds a subtle sweetness and depth that really rounds out the flavor.

Making the Creamy Cheese Sauce

This is where the magic happens. You start by melting the butter in a saucepan over medium heat. Once it’s melted and starting to bubble slightly, whisk in the all-purpose flour. This is your roux, and cooking it for about a minute or two, stirring constantly, helps to get rid of the raw flour taste. You want it to look like a pale, smooth paste. Don’t rush this step; a well-cooked roux is essential for a smooth sauce.

Next, gradually whisk in the milk. It’s important to add the milk slowly, a little at a time, while continuously whisking. This prevents lumps from forming. Keep whisking until all the milk is incorporated and the sauce begins to thicken. You’re looking for a consistency that coats the back of a spoon. This usually takes about 5-7 minutes. Once it’s thickened, reduce the heat to low.

Now for the cheese! Stir in the shredded sharp Cheddar cheese. Keep stirring until the cheese is completely melted and the sauce is smooth and luscious. It should be a beautiful, creamy consistency. Stir in the ¾ teaspoon of kosher salt and the ½ teaspoon of garlic powder. Taste the sauce at this point and add more salt and a generous amount of freshly ground black pepper if needed. Remember, the potatoes will absorb some of the salt, so it’s okay if it tastes slightly seasoned now.

Assembling and Baking the Potatoes

Preheat your oven to 375°F (190°C). Lightly butter a 9×13 inch baking dish. This is where your beautiful layers will be built.

Arrange about half of the sliced potatoes in an even layer on the bottom of the prepared baking dish. Scatter half of the thinly sliced yellow onion over the potatoes. Pour about half of the creamy cheese sauce evenly over this layer. Make sure to get sauce into all the nooks and crannies.

Repeat the layering process with the remaining potatoes, onion, and sauce. Ensure the top layer of potatoes is mostly covered with sauce. This helps them cook evenly and become tender.

In a small bowl, combine the shredded Gruyere cheese and grated Parmesan cheese. Sprinkle this cheesy mixture evenly over the top of the assembled potatoes. This topping will melt into a glorious, golden crust.

Cover the baking dish tightly with aluminum foil. This traps the steam and helps the potatoes cook through and become tender. Bake for 45 minutes.

After 45 minutes, carefully remove the foil. This is when the magic really starts to happen and the topping begins to brown. Return the dish to the oven, uncovered, and bake for another 20 to 30 minutes, or until the potatoes are fork-tender and the topping is bubbly and golden brown. If the topping starts to get too dark before the potatoes are tender, you can loosely tent it with foil again.

Once out of the oven, let the au gratin potatoes rest for about 10 minutes before serving. This allows the sauce to set up slightly, making it easier to serve and preventing it from being too runny. Garnish generously with fresh chopped chives or parsley just before serving. The green adds a lovely pop of color and a fresh contrast to the rich, cheesy potatoes. Enjoy this comforting classic!

Conclusion:

Dad’s Creamy & Cheesy Au Gratin Potatoes are a side dish that truly satisfies, bringing a wonderful richness and comforting flavor to any meal. The combination of tender, thinly sliced potatoes baked in a luscious, cheesy sauce is simply irresistible. They pair beautifully with roasted meats like chicken or beef, or even a hearty steak. For a vegetarian option, serve them alongside a big salad and some crusty bread. If you’re looking for a way to make your dinner feel more festive or just want to treat yourself, this recipe is a winner. Don’t be afraid to play with the cheese; a little bit of a sharper cheddar or even some smoked gouda can add a delightful twist. Baking them until golden and bubbly is the final, glorious step. Give them a try and experience this family favorite for yourself!

What are the best potatoes for au gratin?

Yukon Golds are my top pick because they hold their shape well and have a buttery texture. Russets can work, but they tend to get a bit mushier. Avoid waxy potatoes like red or new potatoes, as they don’t absorb the sauce as nicely.

Can I make this ahead of time?

Yes, you can assemble the au gratin potatoes a day in advance. Cover them tightly and refrigerate. When ready to bake, let them sit at room temperature for about 30 minutes, or add a few extra minutes to the baking time. The cheese topping might need a little extra cheese added before baking if it looks dry.

How do I prevent the top from burning?

If you notice the top is browning too quickly before the potatoes are tender, you can loosely tent the dish with aluminum foil. This will shield the top layer from direct heat while allowing the potatoes to cook through in the creamy sauce.

Dad’s Creamy & Cheesy Au Gratin Potatoes

A classic and comforting side dish, Dad’s Creamy & Cheesy Au Gratin Potatoes features thinly sliced Yukon gold potatoes baked in a rich, cheesy sauce until tender and golden brown.

Prep Time
20 Minutes

Cook Time
1 Hours

Total Time
20 Minutes

Servings
8 servings

Ingredients

• 2 ½ pounds Yukon gold potatoes, sliced into ⅛-inch-thick rounds
• ½ medium yellow onion, thinly sliced
• 3 tablespoons salted butter
• ¼ cup all-purpose flour
• 1 ½ cups whole milk
• 8 ounces sharp Cheddar cheese, shredded
• ¾ teaspoon kosher salt
• ½ teaspoon garlic powder
• Freshly ground black pepper
• 2 ounces shredded Gruyere cheese
• 2 ounces grated Parmesan cheese
• Chopped fresh chives or parsley

Instructions

1. Step 1
   Preheat oven to 375°F (190°C). Butter a 9×13 inch baking dish.
2. Step 2
   In a large bowl, toss the sliced potatoes and onion with salt, pepper, and garlic powder.
3. Step 3
   Arrange half of the potato and onion mixture in the prepared baking dish. Sprinkle with half of the shredded Cheddar cheese.
4. Step 4
   In a medium saucepan, melt the butter over medium heat. Whisk in the flour and cook for 1 minute. Gradually whisk in the milk until smooth. Bring to a simmer, stirring constantly, until thickened.
5. Step 5
   Remove sauce from heat. Stir in the remaining shredded Cheddar cheese until melted and smooth. Season with additional salt and pepper to taste.
6. Step 6
   Pour the cheese sauce evenly over the potatoes in the baking dish. Top with the Gruyere and Parmesan cheeses.
7. Step 7
   Bake for 45-60 minutes, or until potatoes are tender and the top is golden brown and bubbly. Let stand for 10 minutes before serving. Garnish with fresh chives or parsley.

Important Information

Nutrition Facts (Per Serving)

It is important to consider this information as approximate and not to use it as definitive health advice.

Allergy Information

Please check ingredients for potential allergens and consult a health professional if in doubt.