Cheesy Au Gratin Potatoes with Yellow and Sweet Potatoes

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Scalloped potatoes are a classic comfort food side dish, but these au gratin potatoes add an extra layer of flavor and nutrition by combining yellow potatoes and sweet potatoes. The sweetness of the sweet potatoes pairs perfectly with the familiar creaminess of the scalloped yellow potato slices. This cheesy au gratin potatoes with yellow and sweet potatoes recipe makes a perfect side dish for a holiday meal or any time you want to fancy up a weeknight dinner.

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Scalloped potatoes and au gratin potatoes feel like a holiday side dish, but they are so flavorful that they should be a potato casserole you make any time. My love for sweet potatoes has grown, and with the Easter holiday coming, I wanted to make a white and sweet potato recipe. I love sheet-pan meals, like pork chops with sweet potatoes and red potatoes, so I knew I would love this au gratin potato recipe using both types of potatoes.

Ingredients for Au Gratin Potatoes

The ingredients for these au gratin potatoes are heavy on the dairy products, making them some delicious, cheesy potatoes too.

Au Gratin Potatoes ingredients made with yellow and sweet potatoes
  • yellow potatoes – Yukon gold or any other yellow potoates will work. White potatoes will also work. Feel free to even use red skin potatoes.
  • sweet potatoes –
  • garlic cloves
  • sweet onions
  • butter
  • flour
  • milk
  • heavy cream
  • Gruyere cheese
  • thyme
  • garlic powder
  • salt
  • black pepper
  • cheddar cheese

See recipe card for quantities.

Instructions – How to make au gratin potatoes with yellow and sweet potatoes

Preheat the oven to 375 degrees and grease your 13×9 casserole dish.

Peel and slice your potatoes. I used a rotary cheese grater and mandoline to slice these potatoes up. Slice onions. Put them in a bowl and season with salt and pepper.

Peel and slice your potatoes. I used a rotary cheese grater and mandoline to slice these potatoes up. Slice onions. Put them in a bowl and season with salt and pepper.

Make the cream sauce by melting the butter with minced garlic in a saucepan over medium heat.

Make the cream sauce by melting the butter with minced garlic in a saucepan over medium heat. Whisk in the flour and cook for 2 minutes. Gradually whisk in the milk and cream. Bring to a simmer and cook until thickened, about 5 minutes. Remove from heat and stir in the thyme, salt and pepper.

Start layering the scalloped potatoes by pouring 1/4 of the white sauce in the bottom, then a layer of Gruyere cheese.

Start layering the scalloped potatoes by pouring 1/4 of the white sauce in the bottom, then a layer of Gruyere cheese.

Follow up with a layer of 1/3 of the yellow potatoes, sweet potatoes, and onions. Then, follow up with 2 more layers of sauce, gruyere cheese, and potatoes. End with the sauce.

Follow up with a layer of 1/3 of the yellow potatoes, sweet potatoes, and onions. Then, follow up with 2 more layers of sauce, gruyere cheese, and potatoes. End with the sauce.

Top the final layer of white sauce with the shredded cheddar cheese.

Top the final layer of white sauce with the shredded cheddar cheese. Sprinkle the cheese all over the sauce before covering it with aluminum foil. Bake for one hour at 375. Remove the foil to finish baking the au gratin potatoes to brown the top. When the potatoes are fork tender and the cream mixture is bubbly, the au gratin potatoes are done.

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Cut this potato casserole into 12 pieces for easy serving.

Hint: Pour the sauce into the baking dish using a measuring cup to make the sauce easier to handle.

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Substitutions for Potatoes Au Gratin

Here are some potential substitutions for the scalloped potatoes recipe:

Milk/Cream Substitutions:

  • Use all milk instead of milk and cream
  • Substitute unsweetened plant-based milk like almond, oat or soy milk
  • Use half and half instead of milk and cream
  • Use evaporated milk or condensed milk mixed with water

Flour Substitutions:

  • Use a gluten-free flour blend or cornstarch to thicken the sauce
  • Make a roux with melted butter and shredded potatoes

Cheese Substitutions:

  • Use a dairy-free shredded cheese alternative
  • Substitute grated parmesan or pecorino romano
  • Use a blend of cheeses like cheddar, gruyere, swiss, etc.

Low Calories:

  • Use less butter and cheese
  • Use reduced fat milk/cream
  • Omit the cream sauce and toss sliced potatoes in broth or stock

The recipe can be made vegetarian by using vegetable broth and plant-based milk/cheese. The yellow and sweet potatoes can be substituted for other root vegetables, such as parsnips or rutabaga.

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Variations to Scalloped Potatoes or Au Gratin Potatoes

Here are some tasty variations you could try with this au gratin potato recipe:

Scalloped Poatoes

  • Omit the cheese to transform this recipe into scalloped potatoes.

Loaded Au Gratin Potatoes

  • Mix in crumbled cooked bacon, sautéed onions, shredded cheddar, and sour cream into the layers
  • Top with more cheese, bacon bits, and chopped scallions

Southwestern Au gratin Potatoes

  • Use pepper jack or Mexican blend cheese
  • Add diced green chiles, chili powder, and cumin to the cream sauce
  • Garnish with salsa, guacamole, and crushed tortilla chips

Garlic Parmesan Potatoes Au Gratin

  • Use parmesan cheese instead of cheddar
  • Mince several cloves of garlic into the cream sauce
  • Stir in chopped fresh parsley
  • Top with panko breadcrumbs or fried garlic slices

Sweet Potato Marshmallow Bake

  • Omit yellow potatoes and use all sweet potatoes
  • Use brown sugar and butter in the cream sauce
  • Top with mini marshmallows during the last 10 minutes

Mediterranean Au Gratin Potatoes

  • Use yellow potatoes only
  • Add sun-dried tomatoes, kalamata olives, feta cheese to the layers
  • Use Greek yogurt instead of cream in the sauce

Scalloped potatoes are very versatile, so have fun experimenting with different cheese varieties, fresh herbs, seasonings, veggies, and toppings! The basic technique works for all sorts of flavor profiles.

Scalloped and Au Gratin Potatoes Kitchen Essentials

Here are the things I have in my kitchen that made making these cheesy au gratin potatoes. From the casserole dish to the rotary mandolin and cheese grater, find my favorite kitchen tools in my storefront.

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Storing and Making Ahead Au Gratin Potatoes

Storing Leftovers:

Store the leftover potatoes in the fridge and reheat in the microwave for 30-second increments. Microwaving individual servings will result in a better outcome rather than a large amount of the potatoes.

Freezer Cheesy Au Gratin Potatoes:

Make two potato casseroles and freeze one for up to three months. Perfect for Thanksgiving and Christmas dinners. Cook one time and enjoy twice.

Top tip

Do not overfill the casserole dish – as it cooks it will expand and can over flow, especially when you take foil off to brown up the cheese.

FAQ

What is the difference between scalloped potatoes and au gratin potatoes?

Cheese. If the thinly sliced potatoes casserole has cheese in it, they are au gratin potatoes. Scalloped potatoes just have white cream sauce. If you want to use this recipe to make scalloped potatoes, just leave the cheese out.

More Potato Recipes

Looking for other potato recipes like this? Try these yummy and easy potato recipes:

Holiday Hams

When making a holiday ham, here are some of my favorite ham recipes:

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.
This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Cheesy Au Gratin Potatoes with Yellow and Sweet Potatoes

This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.
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Course: potatoes, Side Dish
Cuisine: American
Keyword: au gratin potatoes, scalloped potatoes, Sweet Potatoes, yellow potatoes
Prep Time: 20 minutes
Cook Time: 1 minute
Total Time: 21 minutes
Servings: 12 servings
Calories: 364kcal
Author: Leah Beyer

Ingredients

Instructions

  • Slice potatoes with a mandoline. Slice the onions. Mix together in a bowl and season with salt and pepper.
    Peel and slice your potatoes. I used a rotary cheese grater and mandoline to slice these potatoes up. Slice onions. Put them in a bowl and season with salt and pepper.
  • Melt butter in a sauce pan with the minced garlic. Stir in the flour and let cook for one minute.
    Butter, garlic, and flour making a roux for white sauce for scalloped potatoes.
  • Slowly add the heavy cream, stirring constantly. Then pour in the milk. Season with salt and pepper. When the white sauce just begins to boil, remove from heat and stir in thyme.
    Make the cream sauce by melting the butter with minced garlic in a saucepan over medium heat.
  • Make the casserole. Start with a quarter of the white sauce and shredded Grueyere cheese. Layer a single layer of 1/3 of the potatoes and onions. Pour the next quarter of the what sauce and cheese, then potatoes and onions. Repeat again. Then top off with the cheddar cheese as well.
    Follow up with a layer of 1/3 of the yellow potatoes, sweet potatoes, and onions. Then, follow up with 2 more layers of sauce, gruyere cheese, and potatoes. End with the sauce.
  • Cover with aluminum foil and bake for one hour. Remove the foil for the last 10 minutes of baking.
    Top the final layer of white sauce with the shredded cheddar cheese.
  • If potatoes are not soft to a fork at an hour, keep cooking until potatoes are soft.
    This cheese scalloped potatoes recipe uses both yellow potatoes and sweet potatoes along with onions, white sauce, and lots of cheese to make the ultimate cheesy au gratin potatoes.

Nutrition

Calories: 364kcal | Carbohydrates: 27g | Protein: 14g | Fat: 23g | Saturated Fat: 14g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 6g | Trans Fat: 0.2g | Cholesterol: 72mg | Sodium: 300mg | Potassium: 578mg | Fiber: 3g | Sugar: 5g | Vitamin A: 6156IU | Vitamin C: 17mg | Calcium: 386mg | Iron: 1mg

Leah
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