In my opinion a deviled egg is supposed to be simple and spicy.
8 hard boiled eggs peeled and halved, yolks scooped out into a bowl.
1 tablespoon mayo
2 tablespoons yellow mustard
2 tablespoons of Sriracha hot sauce
Add mayo, mustard, and Sriracha to the cooked egg yolks and mix until smooth. Add mixture back into halved hard boiled eggs, dust with cayenne pepper.
Simple, spicy, delicious...and a cheap side/appetizer for a good BBQ.