Preheat oven to 350 degrees. Parboil the potatoes in water to cover, boil for 10 minutes or until you can easily insert a fork into the potato, drain. Combine cottage cheese, onion, sour cream, and salt in a large bowl.. Fold in cooked potatoes. Spoon potato mixture into a greased baking dish. Top with cheese and sprinkle with paprika. Bake for 30 - 35 minutes or until golden brown. You can prepare ahead - make casserole as directed above. Cover and refrigerate. Bring to room temperature and bake as directed.