Place eggs in a saucepan, cover with water, and bring to a boil. Remove from heat, cover, and let sit for 10-12 minutes. Transfer to an ice bath and cool.
Peel the eggs and cut in half lengthwise. Scoop out yolks into a mixing bowl.
Mash yolks with mayo, mustard, salt, and pepper until smooth. Optional: add vinegar or sriracha.
Transfer yolk mixture into a piping bag or spoon it into the egg white halves.
Mix chili oil, sesame seeds, soy sauce, and garlic. Adjust with sugar or red pepper flakes as needed.
Drizzle chili topping over filled eggs. Garnish with chopped cilantro or scallions.
Notes
Adjust the level of spiciness by adding more or less chili crisp or red pepper flakes to suit your taste.