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Homemade Au Gratin Potatoes Recipe

These Homemade 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 mins
Cook Time1 hr 30 mins
Total Time1 hr 50 mins
Course: Side Dish
Cuisine: French
Servings: 8 people
Calories: 359kcal
Author: The Carefree Kitchen


  • 4 lb Yukon Gold or Red Potatoes washed, peeled, sliced thin
  • ½ cup Onion white or yellow, finely chopped
  • 3 Tablespoons Butter
  • 2 Tablespoons All-Purpose Flour
  • 1 tsp Salt
  • tsp Pepper
  • ½ tsp Garlic Powder
  • 2 cups Half and Half
  • 1 cup Cheddar Cheese shredded


  • Preheat oven to 350 degrees and butter a 9" x 13" baking dish.
  • Wash, peel, and slice potatoes thinly (about ¼") 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 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 an hour. Remove the foil and continue to bake for another 10-20 minutes or until the cheese and the tops of the potatoes are golden brown.
  • Remove from the oven and let cool for at least 5-10 minutes before serving. Enjoy!


Calories: 359kcal | Carbohydrates: 45g | Protein: 10g | Fat: 16g | Saturated Fat: 10g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 1g | Cholesterol: 49mg | Sodium: 455mg | Potassium: 1068mg | Fiber: 5g | Sugar: 2g | Vitamin A: 492IU | Vitamin C: 46mg | Calcium: 197mg | Iron: 2mg