Put the ground chicken in a medium-size mixing bowl, combine oyster sauce, soy sauce, chicken stock together in a cup, slowly pour this liquid into the ground chicken while stirring, until all the liquid absorbs into the meat, then add egg and sesame oil in and mix well.
After all seasoning is mixed into the chicken, add ginger and scallion last, mix well, and ready for folding.
Use a dumpling folder, 1 wrapper to 1tbsp chicken filling per dumpling. After all the jiaozi are folded, boil 1 pot of water in a large pot, add jiaozi in when the water is boiling.
When the water re-boil again, add ½ cup cold water, repeat one more time, all the jiaozi should be floating on top of the water, then they are done.
Enjoy them hot, with some black vinegar and chili oil