Knead all-purpose flour and warm water into a elastic dough; rest for 20 minutes.
Finely mince chicken breast and mix with garlic paste, soy sauce, chopped spring onion, black pepper, and salt.
Roll dough very thin and cut into small round wrappers.
Spoon chicken filling into wrappers, fold, and pleat top edges to enclose.
Steam in a greased steamer for 12 minutes until skins turn translucent.