The first time I made these, I had a recipe, but now I just do whatever so I don't have exact measurements. I really don't think it can be messed up though!
Peel and slice or cube however many potatoes you want. I usually do enough to fill a 9x13. I"ve made huge batches for a big crowd and smaller batches too.
Boil potatoes in milk until tender. I usually do a half milk/half water combo so I don't waste too much expensive milk!
Spray or rub butter in the bottom of the pan. I usually sprinkle some garlic salt on the pan too.
Put first layer of potatoes down. Season with salt (I've found that potatoes can hold quite a bit of salt) pepper, and garlic or whatever other seasoning you like.
Sprinkle with about 1 cup of swiss cheese. Pour about a cup of heavy cream all over. The last time I made them I bought 2 small containers or cream and used them both. If I buy the big container I end up with cream that gets old in my fridge!
Repeat potato layer with more cream and cheese. Bake at 375 for about 45 minutes or until golden and bubbly. So easy and SO yummy. The hardest part is peeling and cutting. I've never tried it with frozen potatoes, but I think it'd work? Goes great with grilling!