When you lift the foil from a pan of scalloped potatoes, the slices should be tender underneath and the top should be just beginning to turn golden. If the slices are cut unevenly, though, the thin ones can soften before the thick ones are ready. That’s why I take a little time with the knife before anything goes into the oven. These scalloped potatoes have a smooth cream sauce and layers that hold together when you scoop them.
I make the sauce on the stovetop before pouring it over the potatoes. The butter and flour cook together first, then whole milk goes in gradually; a few minutes of whisking gives the sauce enough body to cling to a spoon. That head start matters because the potatoes bake beneath the sauce, covered at first and uncovered at the end. After a short rest, the sauce settles between the layers instead of running across the plate. You get tender potatoes, a creamy middle, and a golden top.
Kitchen Note
Bake, Serve, Wear the Vibe 👕
Editor-picked tees our Oven To Fork readers love.
We may earn from qualifying purchases at no extra cost to you.
Watch the sauce as it simmers: it’s ready when it coats the back of a spoon, not when it turns stiff or pasty. Whisk often during those last minutes so the bottom doesn’t catch.
Save these scalloped potatoes for the next time you want creamy layers with a golden top and a sauce that holds its shape.
Why Uneven Potato Slices Leave You With a Mixed-Texture Casserole
Scalloped potatoes bake in layers, so slice thickness has a bigger effect than it does when potatoes are spread across a sheet pan. A thick slice needs longer to soften than a thin one. In the same dish, that can leave you choosing between tender thin slices and a firm center in the thicker pieces. Keeping the Yukon Gold slices at 1/8 inch gives the layers a more consistent starting point.
Arrange them in even layers rather than piling them into a mound. That gives the cream sauce room to flow around the slices, and it keeps the potato layer from being much deeper in one spot than another. A mandoline can help make even slices, but a sharp knife works too; the useful cue is consistency, not a particular tool. If a few slices come out a little different, spread them through the dish instead of stacking all the thick ones together.
The covered part of baking helps the potatoes soften before the top browns. The uncovered finish gives the surface time to turn golden. Those two textures are easier to get when the slices are similar in thickness from the start.
What Yukon Golds and a Flour Roux Bring to These Layers
- Yukon Gold potatoes — Their texture works well in layers that need to become tender while still looking like slices when served. Choose potatoes that feel firm, then peel and slice them evenly. I keep Yukon Golds for this version rather than treating every potato as interchangeable.
- Whole milk — It gives the sauce a creamy body without adding another ingredient. Use fresh milk, but there’s no need to seek out a specialty brand; the sauce gets much of its structure from the butter-and-flour base.
- All-purpose flour — Whisked into melted butter, it thickens the milk into a sauce that coats the potatoes. This is a flour-based sauce, so changing the thickener would change the method and the result; I stick with all-purpose flour here.
- Unsalted butter — Butter greases the baking dish and forms the roux. Unsalted butter lets the kosher salt in the sauce do the seasoning, and a standard grocery-store butter works well.
- Kosher salt and black pepper — They season the cream sauce throughout, rather than only the surface. Whisk them into the milk as you add it so the seasoning spreads evenly through the sauce.
The Sauce-to-Oven Sequence That Gets the Potatoes Tender
Butter the Dish and Slice Evenly
Heat the oven to 350°F and grease a 9×13-inch baking dish with 1 tablespoon of the butter. Peel the Yukon Gold potatoes and slice them 1/8 inch thick. Keep the slices as even as you can; thick pieces are the ones most likely to stay firm when their thinner neighbors are already tender. Set up the dish before making the sauce so it’s ready for assembly.
Cook the Flour in Butter
Melt the remaining 4 tablespoons of butter in a medium saucepan over medium heat. Whisk in the all-purpose flour and cook for 1 minute, whisking so the flour is incorporated into the butter. The mixture should look smooth rather than powdery. Don’t rush past this short cook; the flour needs to be mixed through before the milk goes in.
Whisk the Milk In Gradually
Gradually whisk in the whole milk, kosher salt, and black pepper. Bring the mixture to a gentle simmer, then cook for 3 to 5 minutes, whisking often. The sauce is ready when it thickens enough to coat the back of a spoon. If it still looks thin, give it more time within that range and keep whisking rather than turning the heat high.
Layer, Cover, and Bake
Arrange the potato slices in even layers in the prepared dish, then pour the sauce evenly over them. Cover the dish tightly with foil and bake for 60 minutes. Remove the foil and bake for another 25 to 35 minutes, until a knife pierces the potatoes easily and the top is golden. If the knife meets resistance, the potatoes need more time in the oven.
Give the Layers Time to Settle
Take the baking dish out of the oven and let the potatoes rest for 15 minutes before serving. The rest gives the sauce time to settle among the layers, so it doesn’t run as freely when you scoop. The top should still be golden, and the potato slices should yield easily to a serving spoon. Cutting in too soon makes the portions harder to lift neatly.
Small Layering Choices Without Changing the Classic Ingredients
Stagger the seams for a more connected scoop
As you arrange each even layer, offset the slice edges instead of lining up every seam. It keeps the layers orderly while giving the potatoes a more cohesive feel when you serve them. Keep the slices at the same thickness and use the same sauce; this is a small change to arrangement, not a different ingredient list.
Keep the layers level for a consistent bake
If you prefer a more uniform casserole, spread the slices into even, level layers and avoid letting one area rise higher than the rest. The ingredients and baking method stay the same, but a level surface makes it easier to judge when the top is evenly golden. This is the arrangement I’d choose when tidy portions matter.
Storage and Reheating
- Refrigerator: Refrigerate leftovers in a covered container and use within 3 to 4 days. The sauce firms as it chills, so the potatoes will be less fluid than when freshly baked.
- Freezer: The casserole can be frozen, though the potatoes and cream sauce may soften or separate slightly after thawing. Pack portions airtight and use within 2 to 3 months for best quality.
- Reheating: Reheat covered in a 350°F oven until hot throughout, or warm an individual portion in the microwave. Keep it covered to limit drying; uncovering during reheating can toughen the exposed potato edges before the middle is warm.
Questions That Come Up When the Sauce Meets the Potatoes
Scalloped Potatoes
Ingredients
Equipment
Method
- Heat the oven to 350°F.
- Grease a 9x13-inch baking dish with 1 tablespoon of the butter.
- Melt the remaining 4 tablespoons butter in a medium saucepan over medium heat.
- Whisk in the flour and cook for 1 minute.
- Gradually whisk in the milk, salt, and pepper, then bring to a gentle simmer.
- Cook, whisking often, for 3 to 5 minutes, until the sauce thickens enough to coat the back of a spoon.
- Arrange the potato slices in even layers in the prepared dish.
- Pour the sauce evenly over the potatoes.
- Cover the dish tightly with foil and bake for 60 minutes.
- Uncover and bake for 25 to 35 minutes, until the potatoes are tender when pierced with a knife and the top is golden.
- Let the potatoes rest for 15 minutes before serving.
