Place the eggs in a single layer in a saucepan. Cover with water so that there is about 1 inch of water over the eggs. Bring to a boil, remove from heat, cover, and let stand for 12 minutes.. Drain and rinse eggs under cold water for 1 minute.. Once the outside of the eggs feel cool, crack egg shells and carefully peel under cold water.. Slice eggs in half lengthwise. Remove the yolks and place in a medium bowl. Mash it with a fork.. Add Feltman’s mustard, mayonnaise, relish (optional),salt and pepper and mix well.. Transfer the yolk mixture to a Ziploc bag. Cut off the tip of the bag and evenly pipe the yolks back into the egg white shells, can also be done with a small spoon.. Sprinkle tops with paprika and garnish with chopped chives or green onions, if desired.