Cut eggs in half, lengthwise. Scoop yolk into a small bowl. Add avocado, lime zest, salt and pepper. Mash with a fork until well combined. Spoon egg yolk mixture into egg whites. Top with Sriracha sauce.
Notes
Less air contact keeps it looking fresher! If storing for later use, plastic wrap should touch avocado mix to avoid browning. Cilantro leaves would make a tasty fresh garnish for this quick and easy snack.