Potatoes Au Gratin

Updated at: Thu, 17 Aug 2023 02:59:26 GMT

Step 1

Preheat oven to 400 F.

Step 2

Shred gruyere and cheddar cheeses. Mince garlic cloves. Dice 1/2 yellow onion. Set aside.

Step 3

Peel potatoes. Slice in 1/8 inch thick slices or use a mandolin to make thin slices.

Step 4

Melt 4 tbsp butter in a large pot over medium heat. Add minced garlic and diced onion and cook until soft, about 5 minutes.

Step 5

Sprinkle 1/4 cup flour over onions and cook for 2-3 minutes. Mixture should be clumpy.

Step 6

Pour milk in gradually and stir continuously until thick (mixture should coat the back of a spoon). Add salt, pepper, nutmeg and stir to combine.

Step 7

Turn off heat and stir in 1/2 cup shredded gruyere and 1/2 cup shredded sharp cheddar until combined.

Step 8

Spray a casserole dish with nonstick spray. Cover the bottom of the dish in overlapping layers of sliced potatoes (use 1/2 the potatoes for bottom layer).

Step 9

Spread half of the cheese sauce over the layered potatoes and sprinkle with shredded gruyere and shredded cheddar.

Step 10

Repeat by placing all remaining potatoes in overlapping layers and covering with the remaining cheese sauce. Top with remaining shredded gruyere and cheddar.

Step 11

Cover with foil and bake at 400 F for 40 minutes. Remove foil and continue to bake until golden brown and bubbly, about 15 minutes more.

Step 12

Remove and top with chopped chives. Serve warm.

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