This Duchesse potato recipe is a wonderful way to use leftover mashed potatoes. It's an easy potato casserole recipe and great make ahead party potatoes.
Prepare a batch of mashed potatoes or use leftover potatoes, brought to room temperature.
Add 1 well beaten egg to the mashed potatoes.
Butter a square glass baking dish. Put in potatoes, spreading them evenly in the pan. You can add a few peaks to create interest. Brush top of potatoes with melted butter.
If you have a pastry or piping bag, you can pipe the potatoes into pretty rosettes like the ones pictured above.
Bake at 375° for 30 minutes or until potatoes are heated through and top is brown.
Note: You only need to bake the potatoes for about 10 minutes if you pipe them into small, serving size rounds.