Place eggs in a pot and cover with cold water by about an inch. Bring to a boil over high heat, then immediately remove from heat and cover the pot with a lid. Let the eggs sit undisturbed for 13-15 minutes—this gentle carryover cooking creates perfectly set yolks without that green ring. Transfer the eggs to an ice bath (a bowl with ice water) and let them cool for at least 5 minutes, which stops the cooking process and makes them easier to peel.
While the eggs cool, combine mayo, vinegar, Dijon mustard, garlic powder, and onion powder in a small bowl. Whisk together until smooth and well-blended. Taste and season with salt and pepper to your preference—I find a light hand with salt works best here since the yolks are already richly flavored. This allows you to build the filling while the eggs finish cooling, keeping your workflow efficient.
Gently peel the cooled eggs under cool running water, starting from the wider end where the air pocket makes removal easier. Pat them dry with a paper towel. Carefully slice each egg in half lengthwise and use a small spoon to scoop out the yolks into a separate bowl, being gentle to keep the whites intact and the edges clean for a polished presentation.
Add the scooped yolks to the prepared filling from Step 2 and mash together with a fork until you reach your desired consistency—I prefer leaving it slightly chunky for texture, but you can make it as smooth as you like. If the mixture seems too thick, add a touch more mayo, one teaspoon at a time. Taste again and adjust seasonings if needed.
Transfer the yolk mixture to a piping bag fitted with a star tip or a small zip-top bag with the corner snipped off for easier filling. Pipe the mixture generously into each egg white cavity, creating an attractive mound. Sprinkle the tops evenly with paprika and finish with finely chopped parsley for color and a fresh flavor note. Serve immediately or refrigerate until ready to serve.