Easy Potatoes au Gratin Recipe

By Preppy Kitchen · 75 min

Ingredients

Instructions

1. Preheat the oven to 350°F.
2. Peel the potatoes and slice them about ⅛ inch thick. Peel, halve and thinly slice the onion. Layer the potato and onion slices in a 2 to 3 quart casserole dish, lightly seasoning each layer with salt and pepper.
3. In a medium pot, melt the butter over medium heat. Whisk in the flour and cook for 2 minutes, whisking constantly. Slowly whisk in the warm milk. Keep whisking for 2 to 3 minutes until it starts to bubble and thickens slightly.
4. Off the heat, stir in the cheeses, salt and pepper until melted. Pour the sauce over the potatoes and cover tightly with foil.
5. Bake for 1 hour, or until a fork goes in with slight resistance. If still too firm, keep baking and check every 10 to 15 minutes.
6. Remove the foil and bake a further 20 to 30 minutes, until the top is golden brown and a fork slides easily into the centre.
7. Let the gratin cool for 10 to 15 minutes so the sauce thickens before serving.

Summarized from Preppy Kitchen's video. Watch it for the details.

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