Loved this recipe. I did follow the advice of others and layered the potatoes with salt and pepper and sauce between each layer. I covered them for 30 minutes then baked uncovered for 15 more. Turned the broiler on at the end to get them nice and brown. I’m not sure I needed to cover them but I was afraid they wouldn’t be cooked all the way and I knew it couldn’t hurt them. This simple cheese sauce made the best potato gratin I’ve ever had. I did use real parmesano reggiano cheese. Perfect pairing for any protein. Can’t wait to make them again!
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