Slice the eggs in half, lengthwise and remove the yolks into a medium bowl. Set the cooked egg white halves to the side.
Mash the yolks with a fork, add hummus, chopped Kalamata olives, feta cheese, and a pinch of salt. Combine with the fork until the mixture is cohesive.
Transfer the filling to a plastic zip bag or piping bag. Cut the end and squeeze out filling inside egg white half. Alternatively, use a spoon to stuff the egg halves with the egg mixture.
Sprinkle with additional chopped Kalamata olives, refrigerate for 1 hour and serve.
Notes
Make-Ahead: deviled eggs are best eaten within 24 hours; they can be made the day ahead and kept refrigerated in an airtight container.Leftover Deviled Eggs: leftover deviled eggs can be kept refrigerated for several days, but may not look as pretty.