
Au Gratin Potato Casserole is the ultimate comfort food that warms both the heart and the stomach. Imagine tender chunks of potato enveloped in a rich, creamy sauce and topped with a delectable crunchy layer that gives that perfect texture contrast. This dish is not just a side; it’s a star on any dinner table, whether you’re hosting a cozy gathering or simply treating yourself to a comforting meal at home. Combining simple ingredients, this casserole is an easy way to impress friends and family without spending all day in the kitchen.
Why This Recipe Is a Must-Try
This Au Gratin Potato Casserole is not just another potato dish; it’s a delightful experience. The creaminess of the sauce pairs beautifully with the mild flavor of the russet potatoes, creating a symphony of taste and texture. The cheddar cheese adds a rich depth that complements the potatoes perfectly, while the crispy cornflakes topping brings just the right amount of crunch. Plus, this recipe is incredibly versatile and easy to prepare, making it a must-try for both seasoned chefs and beginners alike. You’ll find yourself reaching for seconds, and maybe even thirds!
Ingredients
- 1 cup whole milk
- 1 cup cream
- 2 tablespoons flour
- 1 teaspoon salt
- ¼ teaspoon ground black pepper
- 5 russet potatoes, cut into 1/2 inch cubes
- 1 cup shredded cheddar cheese
- 3 cups cornflakes
- ¼ cup butter, melted
- Fresh parsley, chopped (for garnish)
How To Make Au Gratin Potato Casserole
Step 1: Preheat Your Oven
Begin by preheating your oven to 375°F (190°C). This step ensures that your casserole will cook evenly and get that beautiful golden crust on top.
Step 2: Prepare the Cream Sauce
In a medium saucepan, combine the whole milk, cream, and flour over medium heat. Whisk together until the mixture is smooth. Add in the salt and ground black pepper. Continue whisking until the mixture starts to thicken – about 3 to 5 minutes. It should coat the back of a spoon.
Step 3: Assemble the Casserole
In a large bowl, add the cubed russet potatoes and pour the creamy sauce over them. Gently fold to ensure all the potatoes are well-coated in the luscious sauce. Then, stir in ¾ cup of the shredded cheddar cheese, reserving the rest for the topping.
Step 4: Transfer to Baking Dish
Grease a 9×13 inch baking dish and pour the potato and sauce mixture into it. Spread out evenly with a spatula.
Step 5: Prepare the Topping
In a separate bowl, combine the cornflakes and melted butter. Stir until the cornflakes are nicely coated. Sprinkle the cornflake mixture evenly over the potato casserole. Finally, add the remaining shredded cheddar cheese on top for that extra cheesy goodness.
Step 6: Bake
Place the casserole in the preheated oven and bake for 45 to 50 minutes, or until the potatoes are tender and the topping is golden brown. If you notice the top browning too quickly, you can cover it with aluminum foil for the latter part of the baking time.
Step 7: Garnish and Serve
Once baked, remove the casserole from the oven and let it cool for a few minutes. Garnish with freshly chopped parsley for a pop of color and freshness. Serve warm and enjoy the delightful goodness!
Expert Tips
- Always taste your cream sauce before adding to the potatoes. Adjust the salt and pepper to your liking.
- For more flavor, consider adding minced garlic or onion powder to the cream sauce.
- If you prefer a lighter option, you can use low-fat milk and cream, but the end result will be less rich.
- Cover the casserole with foil for the first 30 minutes of baking to ensure even cooking without burning the topping.
Variations and Customizations
- Add cooked bacon or sausage for a meatier version.
- Mix in vegetables such as broccoli or spinach for added nutrition and color.
- Experiment with different cheese varieties like mozzarella or gouda for unique flavors.
- For a spicy kick, add a pinch of cayenne pepper or some chopped jalapeños.
How to Store Leftovers
Leftover Au Gratin Potato Casserole can be stored in an airtight container in the refrigerator for up to 4 days. To reheat, preheat your oven to 350°F (175°C) and place the casserole in the oven for about 20 minutes, or until heated through. You can also reheat individual portions in the microwave for quick enjoyment!
FAQ
Can I use other types of potatoes?
Yes! While russet potatoes are ideal for their texture and flavor, you can experiment with Yukon Gold or red potatoes for a slightly different taste and texture.
Can I make this casserole ahead of time?
Absolutely! You can assemble the casserole a day in advance, cover it tightly, and refrigerate. Just add an extra 10-15 minutes to the baking time when you’re ready to bake it.
What can I serve with this casserole?
This casserole pairs beautifully with roasted meats, salads, or a simple vegetable side. It’s very versatile and can complement many dishes.
Is this recipe suitable for freezing?
Yes, you can freeze the assembled casserole before baking. Just wrap it well in plastic wrap and aluminum foil. When you’re ready, thaw it in the fridge overnight and bake as directed.
Conclusion
Making Au Gratin Potato Casserole is a delightfully simple way to create a dish that will impress friends and family alike. The combination of creamy potatoes, sharp cheddar cheese, and a crunchy topping provides a flavorful experience that is hard to resist. With easy-to-follow steps and plenty of room for customization, this recipe is perfect for any occasion. Whether enjoyed as a side or a main dish, you’re sure to have everyone coming back for seconds. So, roll up your sleeves, gather your ingredients, and let’s bring this comforting dish to life!

Au Gratin Potato Casserole
Ingredients
Dairy
- 1 cup whole milk
- 1 cup cream
Dry Ingredients
- 2 tablespoons flour
- 1 teaspoon salt
- ¼ teaspoon ground black pepper
Vegetables
- 5 pieces russet potatoes, cut into 1/2 inch cubes
Cheese
- 1 cup shredded cheddar cheese ¾ cup for mixing, ¼ cup for topping
Toppings
- 3 cups cornflakes
- ¼ cup butter, melted
Garnish
- to taste fresh parsley, chopped for garnish
Instructions
- Step 1: Preheat your oven to 375°F (190°C).
- Step 2: In a medium saucepan, combine the whole milk, cream, and flour over medium heat. Whisk until smooth, then add salt and pepper. Continue whisking until thickened (3-5 minutes).
- Step 3: In a large bowl, add cubed potatoes and pour the creamy sauce over them. Fold gently to coat, then stir in ¾ cup of cheddar cheese.
- Step 4: Grease a 9x13 inch baking dish and pour the potato mixture into it, spreading evenly.
- Step 5: In a separate bowl, combine cornflakes and melted butter. Stir to coat, then sprinkle over the casserole. Top with remaining cheddar cheese.
- Step 6: Bake for 45-50 minutes until potatoes are tender and topping is golden brown. Cover with foil if browning too quickly.
- Step 7: Let cool for a few minutes, garnish with parsley, and serve warm.
Equipment
- Medium Saucepan
- Large Bowl
- 9x13 inch Baking Dish
- Spatula