4 c. mashed potatoes, leftover, seasoned a little dry
1/4 c. diced celery
1/4 c. diced green pepper
1/4 c. diced onion or scallions
2 hard boiled eggs, chopped
5 or 6 tbsp. mayonnaise
3 tsp. mustard

Mix potatoes, mayonnaise and mustard thoroughly. Fold in the celery, peppers and onions. Then the eggs. Taste for seasoning. Add more mayonnaise if it's too dry.