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Cheesy Au Gratin Potatoes
1 hour 10 minutes cook
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Ingredients
  • 4 medium russet potatoes, thinly sliced
  • 1 medium onion, sliced into rings
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 1/2 teaspoon salt
  • 2 cups milk
  • 1 1/2 cups shredded Cheddar cheese
  • Salt
  • Black pepper
Steps
Step 1 of 16
Step 1

Preheat the oven to 400°F.

1. Preheat the oven to 400°F.
2. Butter the bottom and sides of a baking dish.
3. Melt the butter in a saucepan.
4. Stir in the flour until smooth.
5. Slowly whisk in the milk, stirring constantly to prevent lumps.
6. Bring the mixture to a boil and cook until it thickens enough to coat a spoon.
7. Reduce the heat and stir in the shredded cheddar until melted and smooth.
8. Thinly slice the potatoes and onion.
9. Layer potatoes in the baking dish and season with salt and black pepper.
10. Add a layer of sliced onion, then more potatoes and seasoning.
11. Pour the cheese sauce evenly over the potatoes, letting it work down between the layers.
12. Cover with foil lightly coated with cooking spray.
13. Bake for at least 1 hour, or until the potatoes are tender and the sauce is bubbling.
14. Remove the foil near the end and broil briefly until the top is golden.
15. Let the potatoes rest for several minutes before serving so the sauce can thicken.
16. Garnish with fresh chives if desired.
Media

Thinly sliced potatoes and onions bake under a smooth cheddar cheese sauce until tender, bubbling, and golden on top. The result is a rich, satisfying side that works just as well with steak as it does on a holiday table.

Recipe Details
Category Family Dinner Favorite
Cook 1 hour 10 minutes
Description

These au gratin potatoes layer thin slices of russet potato and onion in a baking dish, then cover them with a smooth homemade cheddar sauce. Butter, flour, and milk create the base, while shredded cheddar adds the savory, creamy finish. The potatoes bake covered until tender and bubbling, then the top gets a brief uncovered finish for golden color. Resting the dish for a few minutes allows the sauce to settle before serving. This is a substantial, cheesy side for a steak dinner, family gathering, or holiday meal.