Place the eggs in a pot of water and heat to boiling. Cook for 10 minutes. Remove and set into an ice water bath for 20 minutes.
Peel the eggs and slice them in half.
Scoop the egg yolks into a bowl and add the mayonnaise, mustard, and spices. Mash with a fork until as smooth as you like it to be. Season with salt and pepper, to taste.
Set egg white halves on a platter.
Add the egg yolk mixture to a piping bag fitted with a large round tip.
Pipe the yolk filling into the egg white halves in a circle. Placed the platter into the refrigerator and chill for 15-20 minutes to make it easier to make the groves of the pumpkin.
Use a chopstick to lightly draw lines into the "pumpkins". Place the chive stems into the pumpkin tops.
Chill in the refrigerator in an airtight container until ready to serve.
Notes
Wetting the chopstick before you pull it across the top of the egg mixture will help it glide easily.