Potatoes Au Gratin Recipe

Au Gratin Potatoes in a white casserole.

4.93 from 13 votes

Tender potatoes in a velvety smooth cheese sauce, that's what you want in a side dish and this Potatoes Au Gratin recipe is the best side dish ever made.

Prep Time10

Cook Time1 30

Total Time1 40

Course: Side Dish

Cuisine: American, French

Servings: servings

Author: Kellie

Cost: $8

Equipment

baking dish

Ingredients

3 ounces Butter
1 garlic clove minced
4 tablespoons cornstarch
1 teaspoon kosher salt
1/2 teaspoon fresh ground pepper
2 cups low-fat milk
2 cups shredded white cheddar
5 cups thinly sliced yukon gold potatoes about 5 potatoes, sliced into approximately 1/8-inch rounds
Nonstick cooking spray

Instructions

Preheat oven to 350°.
In a large saucepan, melt the butter over low heat. Stir in the garlic and cook 1 minute. Whisk in the cornstarch, salt and pepper until smooth.
Gradually add the milk and bring to a boil. Cook the sauce stirring constantly until thickened, approximately 2-3 minutes.
Remove from heat and stir in 1 1/2 cups of the cheese until melted. Stir in the potatoes.
Transfer to a 2 quart baking dish coated with cooking spray. Sprinkle with the remaining cheese. Cover and bake 30 minutes. Uncover and bake an additional 30-45 minutes or until the potatoes are tender and the sauce is golden brown and bubbling. A thin knife should slide easily through the potatoes in the center.
Remove from the oven and allow to stand 10 minutes before serving.

Video

Notes

Make Ahead: Assemble the casserole up to 24 hours in advance. Cover tightly and refrigerate. Let sit at room temperature while the oven preheats, then bake as directed. A chilled casserole may need additional baking time.
Storage: Cover and refrigerate leftovers for up to 3 days.
Reheating: Cover and warm in a 350°F oven until heated through, then uncover briefly to re-crisp the top.
Freezing: Not recommended because the potatoes and dairy sauce may change texture after thawing.
Doneness: Because potato thickness and baking dishes vary, use baking time as a guide. The casserole is ready when a thin knife slides easily through the center potatoes.

Nutrition