Cheesy Au Gratin Potatoes with Onions and Parmesan Crust

Name: Cheesy Au Gratin Potatoes with Onions and Parmesan Crust
Prep time: 25 min
Cook time: 50 min
Total time: 1 h 15 min
Yield: 10 servings
Cuisine: American
Ingredients: 6 tbsp All-Purpose Flour; 7 whole Assorted Crackers; 0.75 tsp Black Pepper; 2 tbsp Fresh Parsley; 0.75 cup Green Onion; 1 cup Heavy Cream; 4 lb Russet Potato; 2 tsp Seasoned Salt; 0.33 cup Shaved Parmesan Cheese; 1 cup Shredded Asiago Cheese; 2.5 cups Shredded Cheddar Cheese; 1 whole Sweet Onion; 6 tbsp Unsalted Butter; 1.5 cups Whole Milk

Side Dish 🥗 American High-Protein 💪Sugar-Free Vegetarian 🥦Halal 🕌Kosher ✡️Comfort-Food Pescatarian 🐟

Cheesy Au Gratin Potatoes with Onions and Parmesan Crust layers tender russets and sweet onions under a velvety Cheddar–Asiago cream sauce, then tops it with a crisp Parmesan and cracker crumble. The result is creamy inside, crunchy on top, and richly cheesy throughout. It’s perfect for holiday tables, Sunday dinners, or any time you want a comforting, crowd-pleasing side.

Prep25 mins
Cook50 mins
Serves10
DifficultyMedium

1

Put the potatoes in a large pot, cover with water, add salt, and bring to a boil. Lower the heat to medium-low and simmer until they just start to soften, 15 to 20 minutes; drain.
2

Melt the butter in a saucepan over medium heat; add the flour and whisk until it thickens, 1 to 2 minutes. Pour in the milk and heavy cream; cook and stir until smooth, 2 to 3 minutes. Stir in the Cheddar and Asiago cheese until melted; cook, stirring constantly, until smooth and creamy, 1 to 2 minutes. Season the sauce with salt and pepper.
3

Preheat the oven to 400 degrees F (200 degrees C). Butter a 9x13-inch casserole dish.
4

Arrange about half of the sliced potatoes in the bottom of the baking dish. Place the sweet onion slices and green onions on top; pour about 1/3 of the cheese sauce over the onions. Arrange the remaining potato slices in the dish; pour the 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 starting to brown at the edges, about 30 minutes. Sprinkle parsley over the top to serve.