Fill a large pot with water and bring it to a rolling boil. Gently drop in the mini chicken wontons and cook for 3-5 minutes until they float and are tender.

In a mixing bowl, combine soy sauce, rice vinegar, sesame oil, sugar, and corn starch. Whisk until smooth.

Heat a pan over medium heat, pour in the sauce mixture, and stir continuously until it thickens into a glossy consistency, about 3-4 minutes.

Plate the cooked wontons in a serving bowl and pour the warm sauce over them.

Sprinkle chopped green onions over the wontons before serving to add freshness.