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Au Gratin Potatoes

  • Prep Time: 30 minutes
  • Cook Time: 1 hour - 1 hour 10 minutes
  • Servings: 9
  • Course: Side Dish

Thinly sliced potatoes and onion are layered in a creamy cheese sauce creating the perfect au gratin potato recipe.

Reynolds Kitchens® Tips

Reynolds Kitchens Tip

Bake these cheesy au gratin potatoes in a Reynolds Kitchens® Bakeware Casserole Pan for non-stick serving.


  • 1 small diced yellow onion
  • 4 peeled and thinly sliced russet potatoes
  • 2 tablespoons of unsalted butter
  • 3 tablespoons of flour
  • 2 1/2 cups of milk
  • 2 ounces of shredded Mozzarella cheese
  • 1 cup of breadcrumbs
  • Kosher salt and fresh cracked pepper to taste
  • Reynolds Kitchens® Bakeware Casserole Pan


Step 1

PREHEAT the oven to 375° F.

Step 2

HEAT a medium sized pot on medium heat and add in 1 teaspoon of butter along with the diced yellow onion.

Step 3

COOK the onions until they become brown. Once brown, add in the remaining amount of butter and melt.

Step 4

ADD the flour to the pot and mix until it is combined to form a roux.

Step 5

POUR in the milk and bring it to a boil while occasionally whisking until it becomes very thick, similar to Alfredo sauce.

Step 6

WHISK in the Mozzarella cheese until it is melted and finish with salt and pepper.

Step 7

PLACE the sliced potatoes in a large bowl and pour on the thick cheese sauce and stir until combined.

Step 8

TRANSFER the potatoes and cream to a Reynolds Kitchens® Bakeware Casserole pan.

Step 9

SPRINKLE on the breadcrumbs to cover the top of the potatoes.

Step 10

BAKE the potatoes on 375° for 60 minutes or until golden brown on top and the potatoes are soft.

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