Soak the white bread in water until softened, then squeeze out the excess liquid.
Grind the chicken together with the soaked bread, or combine ground chicken with the bread.
Add the egg, sour cream, and salt.
Mix until well combined.
Shape the mixture into evenly sized meatballs.
Place the meatballs in a lightly greased baking dish or skillet.
Pour a small amount of water into the pan.
Cover and cook gently until the meatballs are fully cooked through (about 20–25 minutes).
Drizzle with melted butter before serving.