These creamy, cheesy scalloped potatoes are the ultimate comfort food side dish—perfectly tender Yukon Gold potatoes layered with a rich, garlicky cream sauce, fresh herbs, and two kinds of cheese. Whether you’re serving them at a holiday feast or a cozy family dinner, this dish never fails to impress.

Ingredients

3 tablespoons butter
1 small white or yellow onion, peeled and thinly sliced
4 large garlic cloves, minced
¼ cup all-purpose flour
1 cup chicken or vegetable stock
2 cups whole milk (or half and half)
1½ teaspoons Kosher salt
½ teaspoon black pepper
2 teaspoons fresh thyme leaves, divided
4 pounds Yukon Gold potatoes, sliced into ⅛-inch rounds
2 cups freshly grated sharp cheddar cheese, divided (*or more if desired)
½ cup freshly grated Parmesan cheese, plus more for serving

Instructions

1. Preheat the Oven

Preheat oven to 400°F (200°C). Grease a 9×13-inch baking dish with cooking spray or butter and set aside.

2. Sauté Onion and Garlic

In a large sauté pan over medium-high heat, melt the butter. Add the onion and cook for 4–5 minutes, until soft and translucent. Stir in the garlic and cook for another 1–2 minutes, until fragrant.

3. Make the Sauce

Sprinkle in the flour and cook, stirring constantly, for 1 minute to form a roux. Slowly whisk in the stock until smooth, then add the milk, salt, pepper, and 1 teaspoon of thyme. Continue cooking for 1–2 minutes, just until the sauce begins to simmer around the edges and thickens slightly. Remove from heat.

4. Layer the Potatoes

Arrange half of the sliced potatoes in the bottom of the prepared baking dish in an even layer. Pour half of the cream sauce over the potatoes. (If you prefer a smoother texture, strain out the onions and layer them separately here.)
Sprinkle evenly with 1 cup cheddar cheese and all of the Parmesan. Add the remaining potato slices, pour the rest of the cream sauce on top, and finish with the remaining 1 cup of cheddar cheese.

5. Bake

Cover the dish tightly with aluminum foil and bake for 30 minutes. Then uncover and bake for an additional 25–30 minutes, or until the potatoes are tender and the cheese is golden and bubbling.

6. Garnish and Cool

Remove from the oven, sprinkle with the remaining teaspoon of fresh thyme and some extra Parmesan cheese. Let rest for 10 minutes before serving to allow the sauce to settle.

Why You’ll Love This Recipe

Rich and Creamy: The perfect balance of cheese, milk, and butter makes each bite indulgent.
Fresh Herbs: Thyme adds an earthy aroma and flavor that elevates the dish.
Perfect for Any Occasion: A guaranteed crowd-pleaser, from weeknights to holiday tables.
Easy to Prepare Ahead: Make and refrigerate before baking, or bake and reheat later.

Tips

Use a mandoline slicer for even, thin potato slices that cook uniformly.
Don’t skip the resting time—it helps the sauce thicken and improves texture.
Shred your own cheese—pre-shredded varieties don’t melt as smoothly.
If using half and half, the sauce will be even richer—great for special occasions.

Variations and Substitutions

Add Protein: Crumbled cooked bacon or diced ham between layers.
Go Meatless: Use vegetable broth and omit Parmesan if making it vegetarian.
Try Other Cheeses: Swap cheddar for Gruyère, fontina, or smoked gouda for a unique flavor.
Add Veggies: Thinly sliced leeks, spinach, or sautéed mushrooms can be layered in.

FAQs

Can I make this ahead of time?
Yes! Assemble it a day ahead, cover, and refrigerate. Bake just before serving. Or bake it fully, then reheat covered in the oven.

Can I freeze scalloped potatoes?
Yes, although the texture may change slightly. Cool completely, then freeze in portions. Reheat covered in the oven.

Can I use russet potatoes?
Yes, but Yukon Golds hold their shape better and have a creamier texture.

Can I make it gluten-free?
Substitute the all-purpose flour with a gluten-free flour blend or cornstarch slurry.

Serving Suggestions

Serve this dish warm as a hearty side to:

Roasted chicken, turkey, or beef
Grilled sausages or pork chops
Vegetarian mains like lentil loaf or baked tofu

Add a crisp green salad or steamed green beans to balance the richness.