This delicious Potatoes Au Gratin recipe is made with layers of thinly sliced potatoes and creamy cheese sauce, and is a luxurious, but simple, French classic.

Looking for more cozy side dishes? Try my Sweet Potato Casserole, Broccoli Casserole, or Stuffing!

A white casserole dish with baked Potatoes Au Gratin and a wooden spoon to serve them.

Why I love this side dish:

  • Feels fancy, but it’s Easy – Only 4 steps and 20 minutes of prep!
  • Pantry Ingredients – You only need potatoes, cheese, butter, flour, milk, cream, and spices!
  • Crowd Favorite – This side dish is definitely seen as “special” and whenever I make it, everyone can’t get enough!

What is the difference between Scalloped Potatoes and Au Gratin potatoes?

Scalloped potatoes and potatoes au gratin are often confused, and for good reason since they are very similar.  The most common difference is that scalloped potatoes are cooked in cream and au gratin potatoes are baked with cheese.  These Au Gratin potatoes are covered with a cheese sauce and shredded cheese on top and baked in the oven.

How to make Potatoes Au Gratin:

Slice russet potatoes into very thin slices (even thinner than ¼ inch thick). You can peel the potatoes or leave the potato skin on. A mandolin can help speed up the process.

Side by side photos of russet potatoes, whole, on a cutting board and then peeled and sliced resting on the cutting board.

Melt butter in a saucepan. Stir in flour until smooth and cook for a minute or two. Slowly stir in milk, garlic, dried onions, salt, and pepper and cook on low until boiling. Cook sauce on low until smooth and boiling, stirring occasionally with a whisk. Stir in 2 cups of shredded cheese.

Assemble by placing half of the sliced potatoes in the bottom of a 9×13 inch pan and pour half of the sauce over them.  Add second layer of potatoes, then remaining sauce, and sprinkle remaining shredded cheese on top.

Four overhead process photos of how to make potatoes au gratin including a layer of thinly sliced potatoes in a baking dish, a wooden spoon pouring cheese sauce on top, a layer of cheddar cheese added and then the baked dish.

Cover dish with aluminum foil and bake at 350 degrees for 30 minutes. Remove foil and bake for an additional 30 minutes, or until potatoes are cooked through and cheese is bubbly.

Make Ahead and Storage Instructions:

To Make Ahead: Prepare up until baking. Cover with tinfoil and refrigerate overnight. Allow dish to come to room temperature before baking.

What to Serve with Au Gratin Potatoes:

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Recipe

A white casserole dish with baked Potatoes Au Gratin and a wooden spoon to serve them.
Prep 20 mins
Cook 1 hr
Total 1 hr 20 mins
Add to Meal Plan

Ingredients
 
 

  • 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)

Instructions
 

  • Peel the potatoes if you’d like. Slice the potatoes into very thin 1/8” slices.
  • In a small saucepan over medium heat, melt butter and stir in flour until smooth. Cook 1-2 minutes, stirring constantly.
  • 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.
  • 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.
  • Place half of the sliced potatoes in a lightly greased 9×13 inch casserole dish. Pour half of the cheese sauce over potatoes.
  • Layer the remaining potatoes on top. Spoon the remaining cheese sauce over the potatoes. Sprinkle remaining cheese on top.
  • Cover with aluminum foil and bake at 350 degrees F for 30 minutes. 
  • Remove foil and continue baking, uncovered, for an additional 30 minutes, or until potatoes are cooked, cheese is browned and sauce is bubbly. 

Notes

Make Ahead Instructions: Prepare up until baking. Cover with tinfoil and refrigerate overnight. Allow dish to come to room temperature before baking.

Nutrition

Calories: 292kcalCarbohydrates: 25gProtein: 11gFat: 16gSaturated Fat: 10gCholesterol: 52mgSodium: 447mgPotassium: 545mgFiber: 1gSugar: 3gVitamin A: 590IUVitamin C: 6.8mgCalcium: 194mgIron: 1.2mg

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*I originally shared this recipe December 2013. Updated December 2018 and November 2021.

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Lauren Allen

Welcome! I’m Lauren, a mom of four and lover of good food. Here you’ll find easy recipes and weeknight meal ideas made with real ingredients, with step-by-step photos and videos.

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  1. 5 stars
    First time making potatoes au gratin and it definitely won’t be the last. I tried this on a whim and it was the first thing gone. Literally, my family basically licked the pan clean. Delicious!

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