Muffin Tin Potatoes Gratin

Ingredients

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• 4 medium russet potatoes, thinly sliced
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• 1 medium onion, sliced into rings
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• salt and ground black pepper to taste
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• 3 tablespoons butter
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• 3 tablespoons all-purpose flour
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• ½ teaspoon salt
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• 2 cups milk
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• 1 ½ cups shredded Cheddar cheese
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Instructions

1. 1
   Gather all ingredients. Preheat the oven to 400 degrees F (200 degrees C). Butter a 2-quart casserole dish.
2. 2
   Layer 1/2 of the potatoes in the bottom of the prepared casserole dish; season with salt and pepper.
3. 3
   Layer onion slices over top, then top with with remaining potatoes. Season again with salt and pepper.
4. 4
   Melt butter in a medium saucepan over medium heat. Gradually whisk in flour and salt and cook, whisking constantly until raw flour flavor has cooked off, about 1 minute.
5. 5
   Gradually add milk, about 1/4 cup at a time, whisking well after each addition to incorporate; the gradual addition and whisking of milk will help avoid lumps in your sauce.
6. 6
   Cook, whisking constantly, until the mixture has thickened, 3 to 5 minutes.
7. 7
   Stir in cheese all at once; continue stirring until melted, 30 to 60 seconds.
8. 8
   Pour cheese sauce over the potatoes, and cover the dish with aluminum foil.
9. 9
   Bake in the preheated oven until potatoes are tender and sauce is bubbly, about 1 ½ hours.