Creamy Cheesy Au Gratin Potatoes: A Classic Comfort Food Casserole

Elevate Your Menu with Classic au Gratin Potatoes

Elevate your side dish game with classic au gratin potatoes that ooze cheesy goodness and creamy comfort in every bite.

Au gratin potatoes are made with thinly sliced potatoes and onions baked in a decadently rich and creamy cheese sauce until tender, bubbling, and golden on top.

Ingredients for Cheesy Au Gratin Potatoes

• 4 medium russet potatoes, peeled and thinly sliced
• 1 medium onion, thinly sliced
• 2 tablespoons butter, plus extra for greasing
• 2 tablespoons all-purpose flour
• 3 cups half-and-half (or whole milk)
• 1 teaspoon salt
• ¼ teaspoon ground black pepper
• 2 cups shredded cheddar cheese (or Colby-Monterey Jack blend)

Step-by-Step Instructions

1. Gather all ingredients. Preheat the oven to 400°F (200°C). Grease a 2-quart casserole dish with butter.
2. In a medium saucepan over medium heat, melt 2 tablespoons butter. Stir in flour and cook for 1–2 minutes to form a roux.
3. Gradually whisk in half-and-half until smooth. Continue cooking, stirring constantly, until the sauce thickens, about 3–4 minutes.
4. Remove from heat. Stir in 1 cup of shredded cheese until melted and silky.
5. Layer half of the potato slices in the prepared dish, followed by half the onions. Pour half the cheese sauce over the top.
6. Repeat layers with remaining potatoes, onions, and sauce. Finish with the remaining 1 cup of cheese sprinkled on top.
7. Cover with foil and bake for 1 hour. Remove foil, bake an additional 15–20 minutes, until the cheese is golden and bubbling.
8. Let rest 10 minutes before serving. Garnish with fresh chives or parsley if desired.

Why You’ll Love This Cheesy Potato Casserole

• Creamy texture: The half-and-half and melted cheese create a luxuriously smooth sauce.
• Family favorite: Perfect comfort food for holidays, potlucks, or weeknight dinners.
• Make-ahead friendly: Assemble in the morning and bake just before serving.

Pro Tips for the Best Gratin

• Slice evenly: Use a mandoline for uniform potato thickness, ensuring even baking.
• Cheese blends: Mix sharp cheddar with Gruyère for a nutty depth of flavor.
• Browned top: Finish under the broiler for 1–2 minutes for an extra-crispy crust.

Prep Time: 30 minutes | Total Time: 2 hours | Servings: 4

Ratings: 4.7/5 from over 5,900 reviews

Enjoy these au gratin potatoes at your next gathering!