I've seen lots of different versions of this, but when I made it this time I didn't bother to use a recipe. I just tossed things together until they looked good! Apparently it worked because our folks cleaned out the pans and I got lots of positive feedback! I'm giving you the recipe as I made it, but of course you can cut it in half for a more reasonable amount.
Baked Potato Casserole
3 pounds red potatoes
10 slices bacon, cooked and crumbled - reserve 1/4 cup drippings
3 green onions, sliced
2 cups shredded cheddar cheese
1 cup sour cream
1/2 cup butter, melted
salt and pepper
Bake the potatoes until tender. (I just scrub them and pop them in the oven. They took about an hour at 400°.)
When the potatoes are cool enough to work with, cube them into bite-size pieces and divided them between two 9 x 13 pans. Sprinkle them with salt and pepper, onions, bacon, and cheese. Pour on the butter, bacon grease, and sour cream (divide it between the two pans). Carefully stir the potatoes until well coated. Cover with aluminum foil and bake at 350° for 20 minutes. Remove foil and bake for another 10 minutes. I served them with more sour cream on the side for those that wanted it.
If you want to make this dish in shifts, you can bake the potatoes the day before and store them in the fridge whole. I wouldn't keep them longer than 24 hours like that, though, as the texture will not be as good.