4.28 from 25 votes
A white casserole dish with baked Potatoes Au Gratin and a wooden spoon to serve them.
Potatoes Au Gratin
Prep Time
20 mins
Cook Time
1 hr
Total Time
1 hr 20 mins

Potatoes Au Gratin made with thinly sliced potatoes, a creamy cheese sauce and topped with shredded cheddar and gruyere cheese.

Course: Side Dish
Cuisine: American
Unit: clove, cup, medium, Tablespoon, teaspoon
Servings: 12
Calories: 292 kcal
Author: Lauren Allen
  • 6 medium russet potatoes
  • 6 Tablespoons butter
  • 6 Tablespoons all-purpose flour
  • 2 cups milk
  • 1 cup heavy whipping cream
  • 1 teaspoon salt
  • 2 cloves garlic , minced
  • 1 1/2 teaspoons dried onion flakes
  • salt and freshly ground black pepper , to taste
  • 3 cups freshly grated sharp cheddar cheese ,or Gruyere, or half of each)
  1. Peel the potatoes if you'd like. Slice the potatoes into very thin 1/8'' slices.

  2. In a small saucepan over medium heat, melt butter and stir in flour until smooth. Cook 1-2 minutes, stirring constantly.

  3. Slowly stir in the milk, cream, minced garlic, dried onions, and season with salt and pepper. Cook sauce on low until smooth and boiling, stirring occasionally with a whisk.

  4. Reduce heat and stir in 2 cups of shredded cheese until melted and smooth. Tastes sauce and add additional salt, pepper, garlic or onion flakes, if desired.

  5. Place half of the sliced potatoes in a lightly greased 8x8 inch (or similar size) casserole dish. Pour half of the cheese sauce over potatoes.

  6. Layer the remaining potatoes on top. Spoon the remaining cheese sauce over the potatoes. Sprinkle remaining cheese on top.

  7. Cover with tinfoil and bake at 350 degrees F for 30 minutes. 

  8. Remove tinfoil and continue baking, uncovered, for another 20-30 minutes more or until potatoes are cooked, cheese is browned and sauce is bubbly. 

Recipe Video

Recipe Notes

To make ahead:

To make Potatoes Au Gratin in advance, prepare the recipe up until baking. Cover with tinfoil and refrigerate overnight. Allow them to rest on your counter for 20 minutes before baking. 

Nutrition Facts
Potatoes Au Gratin
Amount Per Serving
Calories 292 Calories from Fat 144
% Daily Value*
Total Fat 16g 25%
Saturated Fat 10g 50%
Cholesterol 52mg 17%
Sodium 447mg 19%
Potassium 545mg 16%
Total Carbohydrates 25g 8%
Dietary Fiber 1g 4%
Sugars 3g
Protein 11g 22%
Vitamin A 11.8%
Vitamin C 8.3%
Calcium 19.4%
Iron 6.7%
* Percent Daily Values are based on a 2000 calorie diet.