Scalloped Potatoes (MOM) Posted on March 1, 2013 by vanessa Peel potatoes and one onion Grease the dish Layer the potatoes, rings of onions, salt and pepper, etc. In a saucepan, warm 3/4 cup milk with a knob of butter; bring to the boil Pour milk over top of the potatoes Cook for 1-1.5 hours at 350-375