Prepare Filling: In a bowl, mix together 1/2 pound ground chicken, 1 tablespoon unseasoned rice vinegar, 1 tablespoon soy sauce, 1 teaspoon toasted sesame oil, 1 teaspoon garlic, 1 teaspoon fresh ginger, 1 teaspoon light brown sugar, and 2 green onions until well combined.
Lay Out Wonton Wrappers: Place the wonton wrappers on a clean surface. They are usually square-shaped.
Add the Filling: Place about a teaspoon of the filling in the center of each wonton wrapper. Avoid overfilling as it might cause the wontons to burst during cooking.
Moisten Edges: Dip your finger in water and run it along the edges of the wrapper. This helps to seal the dumplings.
Fold Wontons: Bring two opposite corners of the wrapper together to form a triangle and press the edges to seal, ensuring there are no air pockets. Then, bring the other two corners together, dabbing a bit of water where they meet, and press to seal, giving it a typical wonton shape.
Allow the assembled wontons to rest while you prepare the soup.