Cheesy Au Gratin Potatoes

After years of enjoying different potatoes au gratin recipes, I consider myself somewhat of a professional when it comes to the creamy, cheesy, and delicious dish! My mom always asked my sisters and I what we wanted to be served at Thanksgiving dinner each year and the answer was always a resounding potatoes au gratin. I mean can you blame us! You’d be crazy to not like the dish! But anyway, based on my pro status I can tell you that these Cheesy Au Gratin Potatoes are some of the best in the game. They’re not too soupy, not lacking in the cheese department (trust me!), and most definitely are not boring or bland. A true must make!

Cheesy Au Gratin Potatoes are pure cheesy, creamy, melt-in-your-mouth deliciousness! Thinly sliced potatoes are layered here with flavorful onion, minced garlic and topped with a gruyere, cheddar, and parmesan cheese sauce. Easy to make and absolutely delicious to eat, it’s the ultimate Thanksgiving side!

Cheesy Au Gratin Potatoes

Ingredients needed for Homemade Au Gratin Potatoes…

Cheesy Au Gratin Potatoes are such a simple side dish! You need less than 10 easy ingredients. And of course lots & lots of cheese!

  • White Potatoes: Probably the most important ingredient in this cheesy potato dish is of course potatoes! You will need about 6 medium sized white potatoes.
  • Garlic & Onion: Garlic and onion provide tons of delicious flavor to this recipe. Add 3-5 minced garlic cloves and 1 thinly sliced onion.
  • Milk: You will need milk to make the deliciously creamy cheese sauce here. Use 2 1/2 cups of your milk of choice. I used 1% but 2%, whole, or even unsweetened almond milk would work too!
  • Flour: Flour is also used in the cheese sauce, as you will need to make a roux. This helps to thicken the sauce perfectly! Add 1/4 cup all purpose.
  • Butter: Again, butter is needed for the sauce. You will need 1/4 cup! It adds that delicious and rich flavor we all know and love.
  • Cheddar, Gruyere, & Parmesan Cheese: Cheese! Finally my favorite ingredient! These Au Gratin Potatoes call for three different cheeses and the resulting cheesy flavor is to die for. 1 1/4 cup shredded cheddar, 1 1/4 cup shredded gruyere, and 3/4 cup shredded parmesan is perfect. I recommend you use block cheese and shred it yourself for the best taste!
  • Salt & Pepper: Lastly, season these cheesy potatoes with salt and pepper to taste.
Homemade Au Gratin Potatoes

How to make Cheesy Au Gratin Potatoes…

This oven baked cheesy potato casserole is the perfect quick and easy addition to any meal. Especially Thanksgiving dinner!

  1. Set the oven to 350 degrees.
  2. Next thinly slice the potatoes & onion and mince the garlic cloves.
  3. Line the potatoes slices up in three rows down the center of a large baking dish, almost like horizontal stacks.  Place the onion slices in between the potato slices, making sure they are evenly dispersed throughout the whole dish.  Spread the minced garlic on top and add salt & pepper.  Set aside.
  4. Next work on your cheese sauce.  Start by melting the butter and flour together on the stove in a pan over medium heat.  Cook for a couple of minutes until it starts to turn golden in color and creates a slightly nutty smell.
  5. Then add the warm milk to the flour & butter in an even stream.  Whisk constantly while doing this.  Then continue to whisk for about another 5 minutes, while the sauce thickens up.  
  6. Once the sauce has thickened, turn the heat to low and add in the shredded cheese – 1 cup cheddar, 1 cup gruyere, 1/2 cup parmesan.  I recommend you use block cheese that you shred yourself!  Continue whisking until the cheese melts and a creamy sauce forms.  Add salt & pepper to taste.
  7. Then pour the cheese sauce on top of the potatoes and spread evenly.
  8. Top with the remaining 1/4 cup of each of the cheeses.
  9. Bake for 60 minutes.
  10. Enjoy!
Cheesy Potatoes

Cheese Sauce tips…

The creamy cheese sauce in this recipe is made with a simple roux. This helps to make the sauce rich, thick, and of course delicious! I know a roux based sauce can sometimes be intimidating, but it really is as easy as can be to make. And if you follow the tips below you’ll be a pro in no time!

Tips!

  • Melt the butter and flour together until golden brown and smells slightly nutty. It should also be bubbling and simmering a bit.
  • Make sure the milk is warm when you add it to the butter and flour and do so in a constant stream. This helps to prevent clumping.
  • Whisk constantly. You want to whisk the cheese sauce throughout the entire process of making it. This once again helps prevent clumps and ensures a smooth sauce.
  • Once the sauce has thickened (it will be ready when it sticks to the back of a spoon), lower the heat and add in the cheese. Melting low and slow gives the best results!
Cheesy Potato Casserole

Potatoes Au Gratin additions…

  • Bacon! Everything is better with bacon. Potatoes Au Gratin are no exception!
  • More or different cheese! I love the combination of gruyere, cheddar, and parmesan cheese here. They are all sharp cheeses and provide an unbeatable cheesy flavor. But feel free to customize to your liking!
  • Spices & herbs! I used a touch of fresh thyme here for flavor and garnish, but adding more herbs would be delicious. Like rosemary and sage! You could also add spices to up the flavor here, maybe even something with some heat to it.
  • Breadcrumbs on top! Breadcrumbs would give this cheesy casserole an even more golden and crispy crust. So good!
  • Season, season, season! Now this is not an addition, but it is a recommendation. Since the flavors here are pretty basic, the basics are very important. I’m talking salt and pepper! I recommend you be very generous and add to taste!
Cheesy Au Gratin Potatoes

Can I prepare these Cheesy Potatoes ahead of time?

Totally! These cheesy potatoes can be prepared before serving in order to save time later. This is especially great if you are serving at a holiday dinner like Thanksgiving or Christmas!

Simply prepare these potatoes according to the instructions. But instead of baking, cover with foil and place in the refrigerator until it is time to serve. I recommend only prepping 1-2 days in advance!

Storing Cheesy Au Gratin Potatoes…

You can store this recipe in an airtight container in the refrigerator. It will keep for about 1 – 1 1/2 weeks!

Gruyere Au Gratin Potatoes

Looking for more delicious side dishes? Check out some favorites below…

Connect with me!

If you make Cheesy Au Gratin Potatoes or any of my other recipes I would absolutely love to know! Tag me @wellnessbykay on instagram, so I can see and share your recreations!!

Homemade Au Gratin Potatoes

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Cheesy Au Gratin Potatoes

Cheesy Au Gratin Potatoes are pure cheesy, creamy, melt-in-your-mouth deliciousness! Thinly sliced potatoes are layered here with flavorful onion, minced garlic and topped with a gruyere, cheddar, and parmesan cheese sauce. Easy to make and absolutely delicious to eat, it’s the ultimate Thanksgiving side!  

  • Author: Kayla Berman
  • Prep Time: 30 Minutes
  • Cook Time: 60 Minutes
  • Total Time: 1 hour 30 minutes
  • Yield: 10 Servings 1x
  • Category: Baked

Ingredients

Scale
  • 6 medium sized white potatoes, thinly sliced
  • 1 yellow onion, sliced
  • 35 garlic cloves, minced
  • 1/4 cup butter, salted
  • 1/4 cup all purpose flour
  • 2 1/2 cups milk, warm
  • 1 1/4 cup cheddar cheese, shredded
  • 1 1/4 cup gruyere cheese, shredded
  • 3/4 cup parmesan cheese, shredded
  • salt & pepper
  • fresh thyme

Instructions

  1. Set the oven to 350 degrees.
  2. Next thinly slice the potatoes & onion and mince the garlic cloves.
  3. Line the potatoes slices up in three rows down the center of a large baking dish, almost like horizontal stacks.  Place the onion slices in between the potato slices, making sure they are evenly dispersed throughout the whole dish.  Spread the minced garlic on top and add salt & pepper.  Set aside.
  4. Next work on your cheese sauce.  Start by melting the butter and flour together on the stove in a pan over medium heat.  Cook for a couple of minutes until it starts to turn golden in color and creates a slightly nutty smell.
  5. Then add the warm milk to the flour & butter in an even stream.  Whisk constantly while doing this.  Then continue to whisk for about another 5 minutes, while the sauce thickens up.
  6. Once the sauce has thickened, turn the heat to low and add in the shredded cheese – 1 cup cheddar, 1 cup gruyere, 1/2 cup parmesan.  I recommend you use block cheese that you shred yourself!  Continue whisking until the cheese melts and a creamy sauce forms.  Add salt & pepper to taste.
  7. Then pour the cheese sauce on top of the potatoes and spread evenly.
  8. Top with the remaining 1/4 cup of each of the cheeses.
  9. Bake for 60 minutes.
  10. Enjoy!

Keywords: Cheesy Au Gratin Potatoes, Homemade Au Gratin Potatoes, Cheesy Potatoes, Cheesy Potato Casserole, Potatoes Au Gratin Gruyere

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