Potatoes Au Gratin Recipe

potatoes au gratin in sharp steam oven

Looking for a family favorite dish? Look no further! Our Sharp Chef Michelle, the blogger for Sunkissed Kitchen, has provided us with the perfect dish to please even the pickiest eaters. This Potatoes Au Gratin recipe is made to perfection in the Sharp Smart Combi Built-In Steam Oven.

If you make this cheesy deliciousness or another recipe, before you dive in, snap and picture and share it with us using #SharpHome on InstagramFacebook, and Twitter.

Ingredientspotatoes au gratin ingredients

  • 6 potatoes 5 cups sliced potatoes
  • 1 onion
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 1 1/2 teaspoons sea salt
  • 1/4 teaspoon black pepper
  • 2 cups whole milk
  • 1 cup sharp white cheddar cheese shredded
  • 1 tablespoon fresh thyme


  1. Using a mandolin slicer, very thinly slice the potatoes and onion. Set aside.
  2. Preheat the Superheated Steam Oven to Convection/Bake at 350º F for 1 hour.
  3. Make the cheese sauce by first adding the butter to a large skillet over medium heat on your Sharp Cooktop. As the butter melts, add in the flour, stirring to create a roux.potatoes au gratin being prepared in sharp superheated steam oven
  4. Add salt and pepper to the roux, and continue to stir for about a minute until the mixture is bubbling.
  5. Slowly add the milk about 1/2 cup at a time, stirring as the milk warms and begins to bubble. Stir to remove any lumps in the mixture. Continue adding the milk and stirring until all the milk has been added.
  6. Once the milk is smooth, add the cheese, and stir to melt it into the sauce. Add the thyme, and then remove the mixture from heat.
  7. Into a 10-inch round baking dish (a tart pan or pie plate works perfectly for this), add potatoes and onions. Mix the thinly sliced onions into the rounds of potatoes so there is an onion for every few slices of potato. Add them in a round pattern around the outside of the dish. Then, continue to add the rest in an inner circular pattern.
  8. Pour the cheese sauce over the potatoes, and use a fork to work it in between some of the layers of potato and onion, until it’s settled into the dish.
  9. Cover the baking dish with foil, and bake for 1 hour. Remove the foil, reset the oven to Bake/Convection at 350º for 30 minutes, and continue to bake to brown the top.

potatoes au gratin prepared in a dishNotes

*If you don’t have a mandolin, very thinly slice the potatoes and onions using a sharp chef’s knife.

**Save time making this dish by adding the potatoes and onions to a 9×13 inch baking dish, pouring the cheese sauce over the top, and using a fork to coat the vegetables. This dish is delicious, even if you don’t have time for a perfect presentation.

***Gruyere cheese makes a great sub for the cheddar if you’d like a stronger flavored cheese sauce.

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Sharp Smart Combi Built-In Steam Oven (SSC2489GS) (Out of Stock)

MSRP: $3,199.99 $2,499.99


  • 3-in-1 Combination Steam and Convection Wall Oven
  • Cooks with Superheated Steam at Browning Temperatures, Gentle and Regular Steam, Radiant Heat & Convection
  • New Steam Bake and Water Bath Settings
  • Built-In Ready 24″ Oven Can Be Installed in a Wall, Under-the-Counter or Kitchen Island with No Additional Trim Kit Needed
  • Brilliant LCD Display with Touch Navigation
  • No Wet-Wall Installation or Water Line Required
  • Standard 120V Power
  • This product ships FREE via ground freight.  A valid phone number is required during checkout for delivery.

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About Sharp Home Electronics Company of America (SHCA)

SHCA is the US Consumer Products Group of Sharp Electronics Corporation, the US sales subsidiary of Sharp Corporation, a worldwide developer and manufacturer of one-of-a-kind premium technology products.  SHCA includes the manufacturing of premium home appliances in Memphis, TN, together with the sales & marketing, and servicing of home electronics based in Montvale, NJ.  Leading products include Sharp AQUOS™ TVs, Sharp Carousel®, Microwave Drawer™ ovens, SuperSteam+™ ovens, and Plasmacluster® Ion air purifiers.

Sharp Corporation appears on Fortune’s World’s Most Admired Companies for 2023. Sharp Electronics Corporation received a 2023 award for Best Places to Work in NJ. Learn more at http://www.sharpusa.com/.

Sharp, AQUOS, Carousel, Microwave Drawer, SuperSteam+, Plasmacluster, and all related trademarks are trademarks or registered trademarks of Sharp Corporation and/or its affiliated companies. All other trademarks are the property of their respective owners.

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Sharp Smart Combi Built-In Steam Oven (SSC2489GS)

The Sharp’s SSC2489GS Smart Combi Built-In Steam Oven is the start of a cooking revolution.

While regular steam only reaches 212°F, the Smart Combi Built-In Steam Oven can create superheated steam up to 485°F. Steam this hot can roast meats and caramelize sugars so your food can be brown and crispy on the outside, tender and juicy on the inside. With the smart Sharp’s SSC2489GS Smart Combi Built-In Steam Oven, you can grill without smoke, roast without drying, and get the roasty-toasty, tasty results you desire.

And don’t forget, the Sharp’s SSC2489GS Smart Combi Built-In Steam Oven is also a powerful convection oven with even heating for superior baking. That’s three ovens in one!

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