Prepare the Mix Egg Powder: Dissolve 13 grams of Mix Egg Powder with 39 ml water and stir until smooth with no lumps (this measurement is equivalent to 1 whole chicken egg). Let it sit for 2 minutes before using. Make the Filling: In a large bowl, combine ground chicken, shrimp, dissolved egg mix flour, tapioca flour, green onion, soy sauce, oyster sauce, sesame oil, salt, sugar, ground white pepper, and mushroom stock powder. Stir clockwise for 3–5 minutes until the mixture becomes sticky and elastic. Cook a small portion first to check the seasoning.
Fill and Fold the Wontons: Place one wonton wrapper on your palm and add about 1 teaspoon of filling in the center. Moisten the edges with water, fold into a triangle, and press the edges tightly to remove trapped air. Bring the two corners together to form a ring shape. Repeat until all filling is used.
Prepare the Broth: Sauté the minced garlic until fragrant, then pour in the chicken stock or water and bring to a boil. Add sesame oil, salt, sugar, ground pepper, and stock powder. Adjust the seasoning to taste.
Cook the Wontons: Add the wontons one by one into the boiling broth to prevent sticking. Cook for 4–6 minutes or until the wontons float to the surface, indicating they are fully cooked.
Serve: Transfer the wontons and broth into serving bowls. Garnish with green onions, celery, and fried shallots. Serve hot.