Parmesan-Crusted Au Gratin Potatoes and Onion Recipe -
Parmesan-Crusted Au Gratin Potatoes and Onion Recipe
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Parmesan-Crusted Au Gratin Potatoes and Onion

Recipe by  

"Potatoes and onions mixed with a creamy cheese sauce and baked with a crispy cheese topping."

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Ingredients Edit and Save

Original recipe makes 10 servings Change Servings
  • PREP

    25 mins
  • COOK

    50 mins

    1 hr 15 mins


  1. Place potatoes into a large pot and cover with water; add salt and bring to a boil. Reduce heat to medium-low and simmer until just beginning to soften, 15 to 20 minutes; drain.
  2. Melt butter in a saucepan over medium heat; add flour and whisk until the mixture thickens, 1 to 2 minutes. Pour milk and heavy cream into the saucepan; cook and stir until smooth, 2 to 3 minutes. Melt Cheddar and Asiago cheese into the butter mixture; cook while stirring continually until the mixture is smooth and creamy, 1 to 2 minutes. Season the sauce with salt and pepper.
  3. Preheat oven to 400 degrees F (200 degrees C). Butter a 9x13-inch casserole dish.
  4. Layer about half the sliced potatoes into the bottom of the baking dish. Top the potatoes with sweet onion slices and green onions; pour about 1/3 of the cheese sauce over the onions. Arrange the remaining potato slices into the dish; pour remaining cheese sauce over the potatoes. Sprinkle Parmesan cheese and crushed crackers over the top.
  5. Bake in the preheated oven until hot in the center and beginning to brown at the edge, about 30 minutes. Sprinkle parsley over the top of the dish to serve.
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Reviews More Reviews

Oct 20, 2013

DELICIOUS! I followed the recipe to a "T", other than 1/2ing it and making it in an 8" square pan (I also forgot to add the parsley and used 2% milk...ok, but I was CLOSE to recipe ;) ). This is rich and delightful. While I won't make it often because it's so calorie laden, it was delicious. I wasn't sure about the onions, but they really made it (be sure to use sweet onions). I think this sauce would also make an excellent white sauce for mac and cheese! THANKS for the recipe!

Feb 17, 2014

I took this recipe to a potluck and everyone kept raving about how amazing it was. My friend who is a food critic and restaurant owner went on and on about delicious it was. I did add/change a few things. I added some bacon under the onions as well as on top, on the advice of another reviewer. I also added some more cheddar and asiago cheese on top under the crackers and shaved Parmesan cheese. Also the group I was taking the dish to are all big fans of garlic so I minced up a garlic clove and sautéed for a minute in the butter before I added the flour. All the flavors blended perfectly! This will be my go to potluck dish from now on!

Aug 23, 2014

What a great recipe, Great taste and enjoyed by. everyone :). We added a layer of shredded cheese in the middle layer along with diced ham - EXCELLENT!

Dec 13, 2013

This was a big hit at my office Christmas party. I just added fried and chopped maple bacon under the onion layer. Delicious! Thank you! I baked the night before, and then cut up in squares, and put in crock pot to cook on low till lunch at work. Perfect. Maezing

Nov 05, 2013

I modified the recipe a little bit, but follow the base recipe and it turned out great.

Apr 06, 2015

OMG! This is now my go to recipe for au-gratin potatoes. Made this with Easter dinner and everyone's raving about how good they were. My brother even asked for the recipe and he's a wonderful chef. I highly recommend this recipe and would have given it ten stars if I could.

Aug 15, 2014

Very tasty and rich. I thinned it out with an additional 1/4 cup of milk, and added some vegetables to make it into a main dish. Add a bit of bread and it's dinner.


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  • Calories
  • 507 kcal
  • 25%
  • Carbohydrates
  • 41.5 g
  • 13%
  • Cholesterol
  • 96 mg
  • 32%
  • Fat
  • 31 g
  • 48%
  • Fiber
  • 4.6 g
  • 19%
  • Protein
  • 17.1 g
  • 34%
  • Sodium
  • 495 mg
  • 20%

* Percent Daily Values are based on a 2,000 calorie diet.

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