Potatoes Au Gratin

Potatoes au gratin is a casserole recipe with layers of thinly sliced Yukon gold spuds and a cream sauce that includes melted cheese.
Prep Time20 mins
Cook Time1 hr
Total Time1 hr 20 mins
Course: Side
Cuisine: French
Servings: 8 servings
Calories: 168kcal
Author: Jessica Gavin


  • 1/4 cup unsalted butter (60g, 2 ounces)
  • 1 tablespoon minced garlic (8g)
  • 1/2 cup finely chopped yellow onion (72g)
  • 1/4 cup all-purpose flour (30g, 1 ounce)
  • 2 cups whole milk (480 ml)
  • 3/4 teaspoon kosher salt (4g)
  • 1/2 teaspoon black pepper
  • 1/8 teaspoon nutmeg
  • 2 pounds yukon gold potatoes (908g) peeled and cut into 1/8-inch thick slices
  • 1 cup shredded gruyere cheese (117g, 4 ounces)
  • 1 cup shredded sharp cheddar cheese (117g, 4 ounces)
  • 2 teaspoon chopped chives (1g)


  • Set the oven rack to the middle position and preheat oven to 400ºF.
  • Melt butter in a large saute pan over medium-low heat. Add garlic and onions, saute until fragrant, 2 minutes.
  • Add flour, whisk to combine, stir and cook for 2 minutes.
  • Gradually whisk in milk and cook until thickened over medium heat, 2 to 3 minutes.
  • Turn off heat and whisk in salt, pepper, nutmeg, 1/2 cup gruyere, and 1/2 cup sharp cheddar cheese. 
  • Grease the bottom and sides of an 8 by 8 by 2-inch casserole dish.
  • Layer half of the potatoes, in overlapping rows in the dish. Spread half of the cheese sauce over the potatoes. Sprinkle 1/4 cup gruyere and 1/4 cup cheddar over the sauce.
  • Layer the remaining potatoes, followed by cheese sauce, and sprinkle with the remaining gruyere and cheddar cheese.
  • Cover potatoes au gratin with foil and place on a baking sheet.  Bake for 30 minutes, remove the foil and bake until potatoes are tender and cheese is browned and bubbly, 20 to 25 minutes.
  • Garnish potatoes with chives.


Calories: 168kcal | Carbohydrates: 20g | Protein: 5g | Fat: 7g | Saturated Fat: 4g | Cholesterol: 21mg | Sodium: 256mg | Potassium: 548mg | Fiber: 2g | Sugar: 3g | Vitamin A: 275IU | Vitamin C: 13mg | Calcium: 105mg | Iron: 3.9mg
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