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Cheesy Au Gratin Potatoes

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PREP TIME
30 min
COOKING TIME
90 min
TOTAL TIME
120 min
SERVINGS
4 servings
Dinner French
Cheesy Au Gratin Potatoes
Ingredients
  • 4 medium russet potatoes, thinly sliced
  • 1 medium onion, sliced into rings
  • salt and ground black pepper to taste
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 1/2 teaspoon salt
  • 2 cups milk
  • 1 1/2 cups shredded Cheddar cheese
Instructions
1
Preheat the oven to its highest temperature setting, which is 400 degrees F (200 degrees C). Next, take a stick of butter and apply it evenly to the interior surface of a 1-quart casserole dish.
2
Place half of the potatoes at the bottom of the prepared casserole dish, and sprinkle a pinch of salt and pepper over them to enhance flavor. Add layers of sliced onions on top, followed by the remaining potatoes, and season once more with salt and pepper.
3
Take a saucepan of medium size and place it over the middle heat setting. Melt a small amount of butter, about the size of a tablespoon, in the saucepan while stirring occasionally.
4
Gradually pour in a small amount of flour, about 1 tablespoon, and sprinkle a pinch of salt over it. Continue to cook the mixture in the saucepan while stirring constantly until the raw flour taste has completely disappeared, approximately 1 minute.
5
Now, slowly pour in milk, about a quarter cup at a time, and whisk the mixture well after each addition to avoid lumps. The gradual addition of milk will help prevent any clumping in the sauce.
6
Continue to cook, stirring constantly, until the mixture thickens and reaches your desired consistency, which should take around 3 to 5 minutes.
7
Then, pour the entire contents of a block of cheese into the saucepan and stir continuously until it has melted, about 30 to 60 seconds.
8
Pour the cheese sauce over the potatoes and cover the casserole dish with aluminum foil to prevent drying out.
9
Finally, place the covered dish in the preheated oven and bake until the potatoes are tender and the cheese sauce is bubbly, approximately 1 ½ hours.