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Creamy Au Gratin Potatoes

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These decadent Au Gratin Potatoes are thinly sliced, layered with onions and a rich garlic-herb cream sauce, then baked with melty cheese until bubbly and golden—a comforting, elegant side dish perfect for gatherings or a cozy dinner.

Ingredients

Units Scale
  • 1 kg potatoes, thinly sliced
  • 1 onion, thinly sliced
  • 4 garlic cloves, minced
  • 2 tbsp fresh parsley, chopped
  • 1 tbsp all-purpose flour
  • 1/4 tsp grated nutmeg
  • Salt and pepper to taste
  • 60 g butter
  • 400 ml milk
  • 300 g cheese (Gruyère, cheddar, or a mix), grated

Instructions

  1. Preheat oven to 375°F (190°C). Grease a large baking dish.
  2. In a saucepan over medium heat, melt the butter. Add minced garlic and sauté until fragrant, about 1 minute.
  3. Stir in the flour and cook for 1–2 minutes to create a roux.
  4. Gradually whisk in the milk, stirring constantly to avoid lumps. Add grated nutmeg, salt, pepper, and chopped parsley. Simmer until slightly thickened.
  5. Remove from heat and stir in half of the grated cheese until melted and smooth.
  6. In the prepared baking dish, arrange the potato and onion slices upright in rows or a fan shape.
  7. Pour the cheese sauce evenly over the layered potatoes and onions.
  8. Sprinkle the remaining cheese over the top of the dish.
  9. Cover with foil and bake for 35 minutes. Remove foil and bake an additional 20–25 minutes, until golden and bubbling on top.
  10. Let rest for 5–10 minutes before serving. Garnish with extra parsley if desired.

Notes

  • Use a mandoline for evenly sliced potatoes for consistent baking.
  • Combining Gruyère and cheddar gives a balance of creaminess and sharpness.
  • Can be prepped a day ahead and baked before serving.
  • Letting it rest before serving helps the layers set and makes it easier to slice.

Nutrition

Find it online: https://yumfoodusa.com/creamy-au-gratin-potatoes/