Potatoes au gratin

 These au gratin potatoes are my mom's favorite — she considers it a special occasion every time I make them! The creamy cheese sauce and tender potatoes in this classic French dish make a delicious flavor combination.  Serve it with beef tenderloin, alongside a green salad.

Ingredients

These are the ingredients you'll need to make this top-rated au gratin potatoes recipe:

• Potatoes: This recipe starts with thinly sliced Russet potatoes. You can substitute Yukon gold, if you like.
• Onion: Slice one onion into rings to layer with the potatoes.
• Seasonings
  : These creamy au gratin potatoes are simply seasoned with just salt and pepper.
• Butter and flour: The cheese sauce starts with a roux made with butter and all-purpose flour.
• Milk: Make sure you slowly whisk in the milk to create the creamiest consistency.
• Cheese: Because isn't everything better with shredded Cheddar?

How to Make Au Gratin Potatoes

You'll find the full, step-by-step recipe below — but here's a brief overview of what you can expect when you make these creamy potatoes au gratin:

1. Assemble the casserole: Layer half of the potatoes in the bottom of the prepared baking dish. Season. Layer onion slices over top, then top with remaining potatoes. Season again.
2. Make the sauce: Melt the butter in a saucepan. Gradually whisk in flour and salt and cook for about 1 minute. Gradually whisk in the milk. Cook, whisking constantly, until the mixture has thickened. Stir in the cheese.
3. Bake the casserole: Pour the sauce over the potatoes. Cover the dish with foil and bake in the preheated oven until the potatoes are tender and the sauce is bubbling.