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Parmesan-Crusted Au Gratin Potatoes and Onion

Rated as 4.74 out of 5 Stars

"Potatoes and onions mixed with a creamy cheese sauce and baked with a crispy cheese topping."
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1 h 15 m servings 507
Original recipe yields 10 servings


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  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.

Nutrition Facts

Per Serving: 507 calories; 31 41.5 17.1 96 456 Full nutrition

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Read all reviews 36
  1. 42 Ratings

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Most helpful positive review

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 f...

Most helpful critical review

Awful, awful, awful. Absolutely no flavor. I followed directions to the letter and was so disappointed. What a waste of expensive ingredients.

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Least positive

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 f...

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 ...

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 ...

I used 2 cups of heavy cream instead of one. 1 1/4 cups making sauce 3/4 cups poured on before baking. I also mixed asiago, parmesan and chedder cheese with ritz crackers for topping. I did not ...

EXCELLENT!!! I made two batches; one for our Thanksgiving dinner and one for our Church bakesale! They were a definite hit, which I will be making again. The only difference I made with the sec...

Theses were really good potatoes. I really enjoyed the blend of cheeses. Cooking the potatoes before was a bit of a pain. Wondering if I can skip this step and just cook them longer. (Or maybe m...

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, ...

YUMMYx1000!! I added a few extra Ritz crackers for the topping. More crunch is always a good thing. Don't over crush the crackers.

Looking for the best recipe was hard, so many to choose from, but I am very pleased with this one. I made my first dish Christmas 2015 and it was a big hit with my entire family. It will now be...