Found this in a cookbook I just got & remembered your
request for help for Christmas (or Thanksgiving?) dinner.
It sounds good & not too hard.

Golden Potato Squares

5 lbs potatoes
2/3 C butter, melted
1 C chopped onions
1 can (12 oz) evaporated milk
4 eggs, beaten
2 1/2 tsp salt
1/4 tsp pepper
2 1/4 C shredded cheddar cheese

Peel the potatoes & place in cold water to prevent discoloration.
Set aside. preheat the oven to 350 deg F. Grease a 9 x 13 inch
baking dish.

Melt the butter in a large skillet. Add the onion & saute until
limp, about 5 min. Add the milk & bring to a boil. Remove from
the heat.

In a large bowl, combine the eggs, salt, & pepper. Beat until
frothy. Shred the potatoes & add to the egg mixture. Toss to
combine. Add the milk mixture. Set aside 3/4 C of the cheese,
add the rest to the potato mixture & mix well. Spoon the
mixture in the prepared baking dish. Bake for 1 hr. Top with
the reserved cheese & bake for an additional 30 minutes. Cut
into squares & serve hot. Makes 8 - 10 servings