To make deviled eggs, or stuffed eggs, cut the hard-cooked eggs in half lengthwise and remove the yolks.
2. Place the egg yolks, mayonnaise, mustard, salt, pepper, and ½ cup of instant potato flakes in a food processor, and process until smooth, stopping once to scrape down the sides. The potato flakes help to make a full-bodied filling that is perfect for piping into the egg halves.
3. Pipe the filling into the egg white halves. If the mixture seems too dry, just add a little more mayonnaise. You can also just spoon the mixture into the egg halves.
4. If you don’t have a piping bag, you can use a plastic zip-top bag. Just spoon the filling mixture into the bag and seal. Snip a small hole in the corner of the bag, and squeeze the egg mixture through the hole into the egg whites.