Cook your eggs using whatever method you know and love.
Using a food processor to mix the filling gives you a fluffy, light, and amazing texture, but if you don't have one, you can also mix the yolks by hand.
You can prepare the filling mixture up to 1 day in advance. Fill the egg whites just before serving so that they're super fresh.
Store deviled eggs in an airtight container in the fridge for up to 4 days.