Best Scalloped Potatoes

These creamy, tender, and richly flavored scalloped potatoes are the ultimate comfort side dish. With layers of thinly sliced potatoes in a cheesy garlic-infused cream sauce, this version bakes up golden and bubbling every time.

Ingredients

• 3 lbs russet potatoes (about 4–5 large), peeled and sliced ⅛-inch thick
• 4 tbsp unsalted butter
• 1 medium onion, finely chopped
• 4 cloves garlic, minced
• ¼ cup all-purpose flour
• 2 cups whole milk
• 1 cup heavy cream
• 1 tsp salt (plus more for seasoning)
• ½ tsp black pepper
• ¼ tsp ground nutmeg (freshly grated preferred)
• 2 cups shredded sharp cheddar cheese, divided (about 8 oz)
• 1 cup grated Parmesan cheese, divided
• 1 tsp fresh thyme leaves (or ½ tsp dried thyme)
• Optional garnish: chopped fresh chives or parsley

Instructions

1. Prep Potatoes:
   • Preheat oven to 375°F (190°C). Butter a 9×13-inch baking dish.
   • Peel potatoes and slice them uniformly ⅛-inch thick using a mandoline, food processor, or sharp knife. Place slices in a large bowl of cold water to prevent browning while you make the sauce.
2. Make the Cream Sauce:
   • In a large saucepan, melt butter over medium heat. Add onion and cook until soft, about 5 minutes. Add garlic and cook 1 minute more.
   • Sprinkle flour over onions and cook, stirring constantly, for 1–2 minutes until golden.
   • Gradually whisk in milk and heavy cream until smooth. Add salt, pepper, and nutmeg.
   • Cook, stirring frequently, until sauce thickens enough to coat the back of a spoon (about 5–7 minutes). Do not boil.
   • Remove from heat. Stir in 1½ cups cheddar cheese, ½ cup Parmesan, and thyme until melted.
3. Assemble:
   • Drain potato slices and pat dry with a clean kitchen towel.
   • Spread a thin layer of sauce in the bottom of the prepared dish.
   • Arrange a single, slightly overlapping layer of potatoes. Spoon a layer of sauce over potatoes. Repeat layers, ending with sauce. (About 3–4 layers total.)
   • Top with remaining ½ cup cheddar and ½ cup Parmesan.
4. Bake:
   • Cover tightly with foil. Bake for 45 minutes.
   • Remove foil and bake uncovered for another 30–40 minutes, until potatoes are tender and top is golden brown and bubbly. (Test tenderness with a sharp knife.)
   • Let rest 15–20 minutes before serving to allow sauce to set.

Optional Enhancements:

• Add ham: Layer 1½ cups diced cooked ham between potato layers for a main dish.
• Gruyère: Substitute Gruyère for cheddar for a more sophisticated flavor.
• Crispy topping: Mix ½ cup panko breadcrumbs with 2 tbsp melted butter and sprinkle over the top before the final bake.
• Herbs: Add a layer of fresh rosemary or sage between potato layers.

Tips for Perfect Scalloped Potatoes:

• Slice uniformly: A mandoline ensures even cooking.
• Dry potatoes: Patting slices dry helps the sauce cling better.
• Don’t rush the sauce: Cook until properly thickened to avoid a watery result.
• Rest before serving: Letting the dish settle ensures clean slices and creamy texture.
• Make ahead: Assemble up to 1 day ahead, cover, and refrigerate. Add 10–15 minutes to baking time if going straight from fridge to oven.

Serve alongside roast chicken, ham, prime rib, or holiday mains. This rich, comforting dish is always a crowd favorite.