Easy! They are hella bad for you, but it's the holidays :)
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4lbs red or yukon gold potatoes
1 1/2 pints heavy cream
1/2 stick butter
1/2 c parmesan cheese
1 c gruyere cheese shredded
salt and pepper
1 small onion, veeeery thinly sliced
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Boil potatoes whole until half cooked (somewhat soft but still slightly hard centers), allow to cool a bit
Slice potatoes and place 1/3 in layer in casserole dish, scatter 1/3 onions, dot w/ 1/3 butter, salt and pepper well, and 1/3 of parm cheese. Repeat layers 2x more.
Top finished layers with gruyere cheese, then carefully pour cream over dish.
Bake at 350 for about 45 minutes until cream is bubbling and cheese is browned. Let sit for about 10-15 minutes before serving.
80,000 calories per serving for sure, but this is the classic steakhouse au gratin. Once or twice a year with a prime rib roast or a ham, yummmmmmmm!