3 pounds potatoes, cooked and mashed
1/2 cup butter
1/3 cup fat-free dry milk powder
1 egg
1/2 cup mayonnaise
salt and pepper to taste
Preheat oven to 350 degrees F (175 degrees C).
Place potatoes, butter or margarine or butter, milk or milk powder, egg and mayonnaise in a medium bowl. Mix well. Spoon potatoes into a baking dish and sprinkle with salt and pepper. Bake in the preheated oven for 60 minutes, until potatoes are firm and lightly browned.