1. 1. Cook the potatoes in salted boiling water for about 20 minutes. Let them cool, peel them, and cut them into cubes.
2. 2. Heat the sausages in simmering water for a few minutes, then cut them into slices.
3. 3. Finely chop the shallot.
4. 4. In a bowl, mix the mayonnaise, cream, mustard, salt, and pepper.
5. 5. In a salad bowl, mix the potatoes, sausage slices, and shallot. Add the creamy sauce and mix well.
6. 6. Sprinkle with chopped chives or parsley.