Cut eggs in half lengthwise. Separate yolks from whites. Rinse egg whites and pat dry.
In a small bowl, mash egg yolks with a fork. Add sour cream, Dijon, tarragon, lemon juice, and salt, stirring until smooth. Transfer mixture to a piping bag fitted with an open-star piping tip.
Evenly pipe egg yolk mixture into wells of egg whites. Top each with 1 olive half. Garnish with paprika, if desired.
Recipe by Taste of the South at https://tasteofthesouthmagazine.com/sour-cream-deviled-eggs/