Peel hard-boiled eggs, cut each in half lengthwise. Scoop out yolks with a spoon or simply by lightly squeezing and letting them drop into a bowl.
Add olive oil, Dijon mustard, cumin and salt to the bowl with the yolks. Mix well with a fork until creamy.
Using a pastry bag or a spoon fill the egg whites with the yolk mixture. Top with capers and chopped chives. Sprinkle on smoked paprika (optional), black pepper and more salt if desired. Drizzle eggs with olive oil and serve.