Place the eggs into a pot. Fill with water, make sure that the water is 1" above the eggs.
Add 1 tsp baking soda (this will make the egg easier to crack).
Turn to heat to high and bring it to a boil.
Place the lid on (cover) and turn the heat to medium; cook for 1 minute.
Remove the pot from the heat. Let the eggs sit inside the pot for 12 minutes.
Run the eggs under cold water for 1-2 minutes.
Crack and peel the eggs.
Slice the eggs in half (lengthwise) and remove the egg yolk to a medium size bowl; repeat with the rest. Set the egg whites aside.
Mash the egg yolks with a folk until finely pieces.
Add mayonnaise, mustard and apple cider vinegar. Season salt & pepper to taste. Mix/stir everything together until smooth.
Use a pipe (piping bag; star tip) or spoon egg yolk mixture back to the egg white halves.