Indulge in the creamy, cheesy delight of au gratin potatoes, a classic comfort dish that's perfect for any occasion. Thinly sliced potatoes are layered with a rich cheese sauce and baked to golden perfection, creating a side dish that's both satisfying and flavorful.
Most of the ingredients for this recipe are common pantry staples, but you might need to pick up a few items if you don't have them on hand. Make sure to get cheddar cheese for that rich, cheesy flavor, and all-purpose flour to help thicken the sauce. Potatoes are, of course, the star of the dish, so choose a variety that holds up well to baking, like russets or Yukon Golds.

Ingredients For Au Gratin Potatoes Recipe
Potatoes: The main ingredient, providing the base and bulk of the dish. Choose a starchy variety like russets or Yukon Golds for the best texture.
Cheddar cheese: Adds a rich, creamy flavor to the dish. Grate it fresh for the best melting quality.
Milk: Helps create the creamy cheese sauce. Whole milk is best for a richer sauce, but you can use lower-fat milk if preferred.
Butter: Used to create the roux, which thickens the cheese sauce. Adds a rich, buttery flavor.
All-purpose flour: Combined with butter to make a roux, which thickens the cheese sauce.
Salt: Enhances the flavors of the dish. Adjust to taste.
Black pepper: Adds a bit of heat and depth to the flavor. Freshly ground is best.
Technique Tip for This Recipe
When making au gratin potatoes, ensure your potatoes are sliced uniformly thin. This helps them cook evenly and absorb the cheese sauce more effectively. A mandoline slicer can be a great tool for achieving consistent slices.
Suggested Side Dishes
Alternative Ingredients
potatoes - Substitute with sweet potatoes: Sweet potatoes provide a different flavor profile and a slightly sweeter taste, which can add a unique twist to the dish.
grated cheddar cheese - Substitute with gruyere cheese: Gruyere melts well and has a rich, creamy flavor that complements the dish nicely.
milk - Substitute with heavy cream: Heavy cream will make the dish richer and creamier, enhancing the overall texture.
butter - Substitute with margarine: Margarine can be used as a dairy-free alternative while still providing the necessary fat content.
all-purpose flour - Substitute with cornstarch: Cornstarch can be used as a thickening agent and is a good gluten-free option.
salt - Substitute with sea salt: Sea salt can offer a slightly different mineral content and flavor.
black pepper - Substitute with white pepper: White pepper provides a similar heat but with a slightly different flavor profile that can be less pungent.
Other Alternative Recipes Similar to This Dish
How to Store or Freeze This Dish
Allow the au gratin potatoes to cool to room temperature before storing. This helps prevent condensation, which can make the dish soggy.
Transfer the potatoes to an airtight container. If you don't have one large enough, you can use a baking dish covered tightly with plastic wrap or aluminum foil.
Store the container in the refrigerator. The au gratin potatoes will keep well for up to 3-4 days.
For longer storage, consider freezing. Portion the potatoes into individual servings for easier reheating.
Wrap each portion tightly in plastic wrap, then place in a freezer-safe bag or container. This double-layer protection helps prevent freezer burn.
Label the containers with the date. Frozen au gratin potatoes can be stored for up to 2-3 months.
When ready to reheat, thaw the potatoes in the refrigerator overnight. This ensures even reheating and maintains the texture.
Reheat in the oven at 350°F (175°C) until warmed through, about 20-30 minutes. If reheating from frozen, it may take closer to 45 minutes.
For a crispier top, consider reheating uncovered for the last 10 minutes. This will help restore the golden-brown finish.
How to Reheat Leftovers
Oven Method:
- Preheat your oven to 350°F (175°C).
- Place the au gratin potatoes in an oven-safe dish.
- Cover the dish with aluminum foil to prevent drying out.
- Bake for 20-25 minutes, or until heated through. Remove the foil for the last 5 minutes to crisp up the top layer.
Microwave Method:
- Transfer a portion of the au gratin potatoes to a microwave-safe dish.
- Cover the dish with a microwave-safe lid or plastic wrap, leaving a small vent for steam to escape.
- Heat on medium power for 2-3 minutes, then stir.
- Continue heating in 1-minute intervals until thoroughly warmed.
Stovetop Method:
- Place the au gratin potatoes in a non-stick skillet.
- Add a splash of milk or cream to keep them moist.
- Cover and heat over medium-low heat, stirring occasionally, until heated through (about 10-15 minutes).
Air Fryer Method:
- Preheat your air fryer to 350°F (175°C).
- Place the au gratin potatoes in an air fryer-safe dish.
- Heat for 10-15 minutes, shaking the basket halfway through to ensure even heating.
Toaster Oven Method:
- Preheat your toaster oven to 350°F (175°C).
- Place the au gratin potatoes in a toaster oven-safe dish.
- Cover with foil and heat for 15-20 minutes, removing the foil for the last 5 minutes to crisp the top.
Best Tools for This Recipe
Oven: Used to bake the au gratin potatoes at the specified temperature.
Saucepan: Utilized to melt the butter and prepare the cheese sauce.
Whisk: Essential for gradually whisking in the milk to ensure a smooth sauce.
Baking dish: The container in which the potatoes and cheese sauce are layered and baked.
Foil: Used to cover the baking dish during the initial baking period to prevent over-browning.
Knife: Necessary for thinly slicing the potatoes.
Cutting board: Provides a surface for slicing the potatoes.
Measuring cups: Used to measure the potatoes, milk, and cheese accurately.
Measuring spoons: Used to measure the butter, flour, salt, and pepper.
Wooden spoon: Handy for stirring the butter and flour mixture.
Grater: Used to grate the cheddar cheese.
Mixing bowl: Optional, for holding the sliced potatoes before layering them in the baking dish.
How to Save Time on Making This Dish
Use a mandoline: Thinly slice the potatoes quickly and evenly with a mandoline slicer.
Pre-shred cheese: Buy pre-shredded cheddar cheese to save time on grating.
Microwave potatoes: Partially cook the potatoes in the microwave for 5 minutes to reduce oven time.
Make sauce ahead: Prepare the cheese sauce in advance and store it in the fridge until ready to use.
Use foil efficiently: Cover the dish tightly with foil to ensure even cooking and reduce the need for constant checking.

Au Gratin Potatoes Recipe
Ingredients
Main Ingredients
- 4 cups potatoes, thinly sliced
- 1 cup grated cheddar cheese
- 1 cup milk
- 2 tablespoons butter
- 2 tablespoons all-purpose flour
- 1 teaspoon salt
- 0.5 teaspoon black pepper
Instructions
- Preheat your oven to 375°F (190°C).
- In a saucepan, melt the butter over medium heat. Stir in the flour and cook for 1-2 minutes.
- Gradually whisk in the milk, cooking until the mixture thickens and bubbles.
- Remove from heat and stir in the cheese until melted. Season with salt and pepper.
- Layer half of the potatoes in a greased baking dish. Pour half of the cheese sauce over the potatoes. Repeat layers.
- Cover with foil and bake for 30 minutes. Remove foil and bake for an additional 30 minutes, or until potatoes are tender and top is golden brown.
- Let stand for 10 minutes before serving.
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