This Potatoes Au Gratin recipe is a classic and comforting side dish that’s perfect for any occasion. Thinly sliced potatoes are layered with a creamy cheese sauce and baked to golden perfection, creating a dish that’s both delicious and satisfying.

Why You’ll Love This Recipe

  • Flavorful and Cheesy: This dish is packed with cheesy goodness, thanks to a creamy sauce made with Gruyère and Parmesan cheese.
  • Easy to Make: With simple ingredients and straightforward instructions, this recipe is surprisingly easy to prepare.
  • Versatile: Serve it as a side dish for your holiday table, a potluck, or a cozy weeknight dinner.

Ingredients

Here’s what you’ll need to make this delicious Potatoes Au Gratin:

  • Unsalted butter: Adds richness and flavor to the sauce.
  • Onion: Chopped, for flavor and texture.
  • Garlic: Minced, for aromatic depth.
  • All-purpose flour: Used to thicken the sauce.
  • Chicken broth: Low sodium or no sodium added, adds flavor to the sauce.
  • Whole milk or half and half: Creates a creamy sauce.
  • Salt and pepper: To taste.
  • Fresh thyme: Chopped, for garnish.
  • Potatoes: Sliced into ⅛-inch rounds, Yukon Gold potatoes are recommended for their creamy texture and ability to hold their shape.
  • White cheddar cheese: Freshly grated, adds a classic cheesy flavor.
  • Parmesan cheese: Freshly grated, adds a salty and nutty flavor.

Note: You’ll find the complete list of ingredients, along with their exact measurements, in the printable recipe card at the bottom of this post.

How to Make Potatoes Au Gratin

Step 1: Preheat and Sauté Vegetables

Preheat your oven to 350°F (177°C). Lightly grease a 9×13 inch casserole dish with cooking spray. In a medium skillet, melt the butter over medium-low heat. Add the chopped onion and minced garlic, and cook for about 3 minutes, or until softened.

Step 2: Make the Sauce

Sprinkle the flour over the onion and garlic, and stir to combine. Cook for 2 minutes, stirring constantly. Slowly whisk in the chicken broth and milk (or half and half) until the sauce is smooth and thickened. Bring the sauce to a boil over medium heat, whisking constantly. Season with salt and pepper to taste.

Step 3: Layer the Ingredients

Layer about ⅓ of the potato slices on the bottom of the prepared casserole dish. Top with ⅓ of the sauce and ½ cup of the shredded cheddar cheese. Repeat the layers twice, ending with a final layer of potatoes, sauce, and the remaining cheddar cheese. Sprinkle the grated Parmesan cheese evenly over the top.

Step 4: Bake

Cover the casserole dish with aluminum foil and bake for 45 minutes. Remove the foil and bake for another 45 minutes, or until the potatoes are fork-tender and the top is golden brown. If desired, broil for a couple of minutes to achieve a deeper golden brown color.

Step 5: Garnish and Serve

Remove the Potatoes Au Gratin from the oven and garnish with fresh chopped thyme. Serve hot as a side dish with your favorite main course.

Pro Tips for Making the Recipe

  • Use the right potatoes: Yukon Gold or red potatoes are recommended for this recipe because they hold their shape well during baking and have a creamy texture.
  • Grate your own cheese: Freshly grated cheese melts more smoothly and has a better flavor than pre-shredded cheese.
  • Layer the ingredients: Layering the potatoes, sauce, and cheese ensures even cooking and prevents the potatoes from becoming mushy.

How to Serve Potatoes Au Gratin

  • Holiday Side Dish: These Potatoes Au Gratin are a perfect side dish for Thanksgiving, Christmas, or any holiday meal.
  • Weeknight Dinner: Serve them as a comforting and flavorful side dish for any weeknight dinner.
  • Potluck Dish: They’re a crowd-pleasing dish that’s easy to transport and serve at potlucks or gatherings.

Make Ahead and Storage

Make Ahead:

You can prepare the dish up to the baking step a day ahead of time. Cover the casserole dish with foil and refrigerate overnight. When you’re ready to bake, preheat the oven and bake as directed.

Storing Leftovers

Leftovers can be stored in an airtight container in the refrigerator for up to 4 days.

Freezing:

Freezing potatoes au gratin may affect the texture and flavor. However, if you need to freeze them, store them in an airtight container and freeze for up to 2 weeks for best results.

FAQs

Can I use a different type of cheese?
Yes, you can use other types of cheese, such as Gruyère, Monterey Jack, or a blend of cheeses.

Can I make this recipe without milk?
Yes, you can use all chicken broth or vegetable broth for the sauce, but it will have a less creamy texture.

Can I make this recipe in a slow cooker?
Yes, you can! Sauté the vegetables separately, then add them to the slow cooker with the remaining ingredients and cook on low for 6-8 hours.

How can I make this dish vegan?
You can use vegan butter and cheese substitutes, and plant-based milk.

There you have it! A delicious and easy-to-make recipe for Potatoes Au Gratin that’s perfect for any occasion. Enjoy!

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Potatoes Au Gratin Recipe

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  • Author: Stacy Corbo
  • Prep Time: 20 minutes
  • Cook Time: 1 hour 45 minutes
  • Total Time: 2 hours 5 minutes
  • Yield: 8 servings 1x
  • Category: Main Course
  • Method: Baking
  • Cuisine: American

Description

This Potatoes Au Gratin recipe is a classic and comforting side dish that’s perfect for any special occasion or holiday meal. Thinly sliced potatoes are layered with a creamy cheese sauce and baked to golden perfection, making for a truly decadent and satisfying dish.


Ingredients

Units Scale
  • 1/4 cup unsalted butter
  • 1 medium onion, chopped
  • 3 cloves garlic, minced
  • 1/4 cup all-purpose flour
  • 1 cup low-sodium or no-sodium chicken broth
  • 2 cups whole milk (or half and half)
  • 1/2 teaspoon salt, or to taste
  • 1/2 teaspoon black pepper, or to taste
  • 1 tablespoon fresh thyme, chopped, for garnish
  • 3 pounds Yukon Gold potatoes, sliced into 1/8-inch rounds
  • 2 cups freshly grated white cheddar cheese
  • 1/2 cup freshly grated Parmesan cheese

Instructions

  • Preheat and Prep: Preheat oven to 350°F (175°C). Lightly grease a 9×13 inch casserole dish with cooking spray.
  • Sauté Vegetables: Melt butter in a skillet over medium-low heat. Add onion and garlic, and cook until softened. Sprinkle with flour and cook for 2 minutes more, stirring constantly.
  • Make Sauce: Gradually whisk in chicken broth and milk until smooth. Bring to a boil over medium heat, whisking constantly. Season with salt and pepper.
  • Layer Ingredients: In the prepared casserole dish, layer ⅓ of the potatoes, ⅓ of the sauce, and ½ cup cheddar cheese. Repeat layers twice, ending with Parmesan cheese on top.
  • Bake: Cover the dish with aluminum foil and bake for 45 minutes. Uncover and bake for another 45 minutes, or until golden brown and potatoes are tender. Broil for a few minutes if needed for extra browning.
  • Serve: Garnish with fresh thyme and serve hot.

Notes

  • Potatoes: Use Yukon Gold or red potatoes for best results.
  • Make Ahead: Assemble the dish ahead of time and refrigerate overnight.
  • Cheese: Grate cheese from a block for optimal melting and flavor.
  • Layering: Layer the ingredients for even cooking and a creamy texture.
  • Storage: Refrigerate leftovers for up to 4 days or freeze for up to 2 weeks.

Nutrition

  • Serving Size: 1 Serving
  • Calories: 400kcal
  • Sugar: 5g
  • Sodium: 500mg
  • Fat: 25g
  • Saturated Fat: 14g
  • Unsaturated Fat: 9g
  • Trans Fat: 0g
  • Carbohydrates: 30g
  • Fiber: 3g
  • Protein: 15g
  • Cholesterol: 60mg

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