c("Peel and chop potatoes, cook in boiling salted water until tender, drain well.", "Mash until smooth, mix with mayonnaise, sour cream, milk, lightly beaten eggs, mustard and parsley; season with salt and pepper.", "Press mixture though a sieve, spoon mixture evenly into a greased casserole dish.", "Sprinkle with grated cheeses.", "Bake in a moderate oven 20 - 30 minutes or until golden on top.")