Pour thickened sauce over potatoes, add 1 tsp. yellow mustard, 3 Tbl. mayonnaise.
Optional: 1/2 c. chopped celery 1/2 c. chopped onion (I usually put the onion)
It is to be served warm, can't make too far in advance. Is good after being refrigerated, but if I eat left overs, I usually warm it in the microwave. Enjoy! It's yummy yummy! I never bring home leftovers!