Lightly brown hamburger and onion. Add salt and pepper. Add soup and paprika.
Peel, pare and slice potatoes. Place half of potatoes in bottom of buttered baking dish. Cover with layer of meat mixture, then another layer of potatoes. Pour enough milk over until it shows around the edges.
Bake at 350 degrees F until potatoes are soft; 1 1/2- 2 hours.