What are huevos rellenos stuffed with?

Huevos rellenos, or stuffed eggs, are typically filled with a mixture of the egg yolks combined with ingredients such as mayonnaise, mustard, and spices. Common variations may also include ingredients like chopped vegetables, herbs, or even seafood for added flavor. The mixture is then piped or spooned back into the egg white halves, often garnished with paprika or fresh herbs. This dish is popular in various cuisines, especially in Latin American and Spanish cooking.