Preheat oven to 350°F. Set aside a 9.5x11-inch baking dish.
Layer the potatoes and sausage into the baking dish, pressing down on the top so everything is fairly level. Pour the cream over potatoes just to the point where you can press down on the top layer and the top potato slices disappear under the cream. Give a couple presses down on the potatoes and then taste cream for seasoning. You should just marginally taste the salt. Add a sprinkle more if needed.