Creamy Au Gratin Potatoes

5 from 1 vote

These creamy au gratin potatoes are an easy, cheesy side dish that is impossible to resist. Thinly sliced potatoes are cooked to melt-in-your-mouth perfection in a rich cheddar cheese cream sauce.

Prep Time20

Cook Time1 30

Total Time1 50

Course: Side Dish

Cuisine: French

Servings: people

Calories: 355kcal

Author: The Carefree Kitchen

Ingredients

4 pounds Yukon gold potatoes washed, peeled, and sliced thin
1/2 cup onions white or yellow; finely chopped
4 tablespoons butter
3 tablespoons all-purpose flour
1 teaspoon salt
1/8 teaspoon black pepper
1/2 teaspoon garlic powder
3 cups half & half
2 cups cheddar cheese shredded (divided)

US Customary - Metric

Instructions

Preheat oven to 350 degrees F and butter a 9" x 13" baking dish.
Wash, peel, and slice potatoes thinly (about 1/4") using a mandoline slicer or a sharp knife, then layer them evenly inside the prepared casserole dish. You want them to be slightly overlapping and covering the entire dish. Sprinkle the onions evenly over the potatoes.
In a medium saucepan over medium heat, add the butter and melt. Whisk in the flour, salt, pepper, and garlic powder and stir constantly for one minute. Slowly add in the half and half and continue to cook and stir over medium heat until the mixture has thickened.
Once thickened, add 1 cup of the cheese and stir until melted. Remove from heat and pour the cheese mixture over the potatoes and onions.
Cover the baking dish with aluminum foil and bake in a preheated oven for about 1 hour. Remove the foil, sprinkle the remaining 1 cup of cheese over the top, and bake for 20 to 30 minutes more, until bubbly and golden brown.
Remove from the oven and let cool for at least 5-10 minutes before serving. Enjoy!

Notes

Storing leftovers: store leftovers in the refrigerator, covered, for up to 3 days. Or, freeze for up to 1 month and thaw in the fridge overnight.

Reheating: To reheat a single portion, transfer it to a microwave-safe container and warm for about 1-2 minutes. Otherwise, preheat an oven to 350 degrees, pull the baking dish out of the fridge for at least 30 minutes prior, then heat for about 20-30 minutes until warmed through.

Make-ahead tips: prepare the potatoes, then cover in foil and store in the fridge overnight. Once you are ready to bake, preheat your oven to 350 and let the baking dish sit at room temperature for about 30 minutes before baking as directed.

Nutrition