Ingredients
Equipment
Method
Prepare the dish
- Heat the oven to 350°F.
- Grease a 9x13-inch baking dish with 1 tablespoon of the butter.
Make the cream sauce
- 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.
Assemble and bake
- 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.
Notes
For even cooking, slice the potatoes uniformly to 1/8 inch thick. Refrigerate leftovers for up to 4 days; freezing is not recommended because the sauce may separate. For a dairy-free variation, use unsweetened plain plant milk and dairy-free butter.
