Remove egg yolks from whites and place yolks in a medium bowl. Stir in mayonnaise, lemon juice, and mustard until combined. Season with salt and pepper.
On a cutting board, chop egg whites into small bits and fold into yolk mixture. Scoop out flesh from the lower half of each piece of avocado and smash in a small bowl. Stir smashed avocado into egg mixture. Season with salt and pepper.
Fill half scooped avocado shells with avocado-egg mixture. Drizzle with Sriracha and top with red pepper flakes and chives.
Recipe by 5* trending recipes with videos at https://food.theffeed.com/2019/08/05/deviled-avocados/