Chicken Mushroom Gyoza

Name: Chicken Mushroom Gyoza
Ingredients: 3 ounces (85 grams) shiitake mushrooms (about 6 large shiitakes, finely diced); 5.3 ounces (150 grams) onions (1 small onion, minced); 1/4 cup chicken stock; 11.6 ounces (330 grams) ground chicken; 12 grams ginger (minced); 1 tablespoon oyster sauce; 1 teaspoon sesame oil; 1/2 teaspoon potato starch; 1/8 teaspoon salt; 1/8 teaspoon white pepper; 36 potsticker wrappers; vegetable oil (for frying)