Indulge in the creamy, cheesy goodness of au gratin potatoes, a classic comfort food dish that is perfect for any occasion. This recipe combines thinly sliced potatoes with a rich cheddar cheese sauce, baked to golden perfection. Whether you're serving it as a side dish for a holiday meal or a weeknight dinner, these au gratin potatoes are sure to be a hit.
Most of the ingredients for this recipe are common pantry staples, but you may need to pick up a few items if you don't have them on hand. Cheddar cheese is essential for the rich, cheesy flavor, so make sure to get a good quality one. All-purpose flour is used to thicken the sauce, and butter adds a rich, creamy texture. If you don't usually stock milk, you'll need that as well to create the smooth sauce.

Ingredients For Au Gratin Potatoes Recipe
Potatoes: Thinly sliced to ensure even cooking and a tender texture.
Cheddar cheese: Grated to melt smoothly into the sauce, providing a rich, cheesy flavor.
Milk: Used to create a creamy sauce that binds the dish together.
Butter: Melted to form the base of the sauce, adding richness.
All-purpose flour: Combined with butter to thicken the sauce.
Salt: Enhances the overall flavor of the dish.
Black pepper: Adds a hint of spice and depth to the flavor profile.
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 better. A mandoline slicer can be very useful for achieving consistent slices. Additionally, when making the cheese sauce, whisk continuously while adding the milk to prevent lumps and ensure a smooth, creamy texture.
Suggested Side Dishes
Alternative Ingredients
thinly sliced potatoes - Substitute with sweet potatoes: Sweet potatoes add a different flavor profile and a touch of sweetness.
thinly sliced potatoes - Substitute with cauliflower: Cauliflower provides a lower-carb option and a different texture.
grated cheddar cheese - Substitute with grated Gruyère cheese: Gruyère offers a nutty and slightly sweet flavor that melts well.
grated cheddar cheese - Substitute with Parmesan cheese: Parmesan adds a sharp, salty flavor and a different texture.
milk - Substitute with heavy cream: Heavy cream creates a richer and creamier sauce.
milk - Substitute with unsweetened almond milk: Almond milk provides a dairy-free alternative with a slightly nutty flavor.
butter - Substitute with margarine: Margarine is a plant-based alternative that works similarly in cooking.
butter - Substitute with olive oil: Olive oil offers a healthier fat option and a different flavor.
all-purpose flour - Substitute with cornstarch: Cornstarch thickens the sauce similarly and is gluten-free.
all-purpose flour - Substitute with rice flour: Rice flour provides a gluten-free alternative with a similar thickening effect.
salt - Substitute with sea salt: Sea salt offers a different mineral content and flavor.
salt - Substitute with kosher salt: Kosher salt has larger crystals and a different texture.
black pepper - Substitute with white pepper: White pepper provides a milder flavor and a different color.
black pepper - Substitute with cayenne pepper: Cayenne pepper adds a spicy kick and a different flavor profile.
Other Alternative Recipes Similar to This Dish
How to Store / Freeze This Dish
Allow the au gratin potatoes to cool completely at room temperature before storing. This helps prevent condensation, which can make the dish soggy.
Transfer the cooled potatoes to an airtight container. If you prefer, you can also use a resealable plastic bag, ensuring you remove as much air as possible to maintain freshness.
For short-term storage, place the container in the refrigerator. The au gratin potatoes will stay fresh for up to 3-5 days.
If you plan to keep the potatoes for a longer period, consider freezing them. Wrap the entire baking dish tightly with plastic wrap, followed by a layer of aluminum foil to prevent freezer burn.
Alternatively, portion the au gratin potatoes into individual servings before freezing. This makes reheating easier and more convenient. Use freezer-safe containers or bags for this method.
Label the containers with the date to keep track of storage time. 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 gradual thawing helps maintain the dish's texture and flavor.
Reheat the au gratin potatoes in an oven preheated to 350°F (175°C) for about 20-30 minutes, or until heated through. If reheating from frozen, you may need to add an additional 10-15 minutes to the baking time.
To prevent the potatoes from drying out during reheating, cover the dish with aluminum foil. Remove the foil during the last 5-10 minutes to allow the top to crisp up.
Enjoy your reheated au gratin potatoes as a delicious side dish, just as flavorful and comforting as when freshly made.
How to Reheat Leftovers
Preheat your oven to 350°F (175°C). Place the au gratin potatoes in an oven-safe dish, cover with aluminum foil to prevent drying out, and bake for 20-25 minutes, or until heated through.
For a quicker option, use the microwave. Place a portion of the au gratin potatoes on a microwave-safe plate, cover with a microwave-safe lid or plastic wrap (leaving a small vent), and heat on medium power for 2-3 minutes. Stir halfway through to ensure even heating.
If you prefer a crispy top, use the broiler. First, reheat the au gratin potatoes in the microwave for 2-3 minutes, then transfer to an oven-safe dish and broil on high for 2-3 minutes, or until the top is golden and bubbly.
For stovetop reheating, place the au gratin potatoes in a non-stick skillet over medium-low heat. Cover and cook, stirring occasionally, for 10-15 minutes or until heated through. Add a splash of milk or cream if the potatoes seem dry.
Best Tools for This Recipe
Oven: Used to bake the au gratin potatoes at a consistent temperature of 375°F (190°C).
Saucepan: Essential for melting butter and preparing the cheese sauce by combining flour, milk, and cheese.
Whisk: Helps in gradually whisking the milk into the butter and flour mixture to ensure a smooth and thickened sauce.
Measuring cups: Necessary for accurately measuring the milk and grated cheddar cheese.
Measuring spoons: Used to measure out the salt, pepper, and flour precisely.
Knife: Needed to thinly slice the potatoes evenly.
Cutting board: Provides a stable surface for slicing the potatoes.
Baking dish: A greased dish where the layered potatoes and cheese sauce are baked.
Aluminum foil: Used to cover the baking dish during the initial baking period to ensure the potatoes cook evenly.
Grater: Essential for grating the cheddar cheese.
Mixing spoon: Useful for stirring the cheese into the sauce until it melts and combines well.
Oven mitts: Protect your hands when placing the dish in and out of the oven.
Cooling rack: Allows the baked dish to cool slightly before serving.
How to Save Time on This Recipe
Use a mandoline: Slice the potatoes quickly and evenly with a mandoline to save time.
Pre-shredded cheese: Opt for pre-shredded cheddar cheese to skip the grating step.
Microwave potatoes: Partially cook the potatoes in the microwave for a few 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 aluminum foil to ensure even cooking and reduce the need for additional baking time.
Au Gratin Potatoes Recipe
Ingredients
Main Ingredients
- 4 cups thinly sliced potatoes
- 1 cup grated cheddar cheese
- 1 cup milk
- 2 tablespoons butter
- 2 tablespoons all-purpose flour
- 1 teaspoon salt
- ½ 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, and cook until the mixture has thickened and is smooth.
- Add the salt and pepper, then stir in the grated cheese until melted and well combined.
- Layer half of the sliced potatoes in a greased baking dish. Pour half of the cheese sauce over the potatoes. Repeat with the remaining potatoes and cheese sauce.
- Cover with aluminum foil and bake for 45 minutes. Remove the foil and bake for an additional 15 minutes, or until the top is golden and bubbly.
- Let it cool for a few minutes before serving. Enjoy!
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