Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4      cup           cold mashed potatoes
   1 1/2  cup           all-purpose flour
   6                    egg yolks
   2      Teaspoon      salt
     1/4  Teaspoon      pepper
   1      Teaspoon      prepared mustard
  12 1/2  Ounces        shredded Parmesan cheese
   6      quart         hot water
   1      Tablespoon    salt
     1/2  cup           butter or margarine -- melted

Preparation:

Start heating oven to 350 F. In a large bowl, combine mashed potatoes, flour, egg yolks, 2 tsp salt, pepper, mustard and 10 ozs shredded cheese. Meanwhile, in a large kettle, bring the hot water to a slow boil; add 1 tbs salt. In large pastry bag, with large plain tube No. 8 in place, put some of potato mixture. Holding bag over simmering water, force contents through tube, snipping it into 3/4" ;pieces of gnocchi with scissors. Cook gnocchi gently until they rise to surface, when they will be done. As gnocchi rise, remove at once with a slotted spoon; drain well on paper towels; place in buttered 1 1/2-qt. shallow casserole; keep warm in oven. Repeat snipping, cooking, draining, and warming remaining dough until all is used up. Remove casserole from oven; turn broiler to Broil; pour butter over gnocchi, and sprinkle with remaining shredded cheese. Broil till golden - about 5 minutes.