Dough
- 4 tablespoons sugar
- 1 cup warm water
- 1 ½ teaspoons instant yeast
- 3 ¼ cups all purpose flour
- 2 tablespoons canola oil, plus more for oiling bowl
- 1 ½ teaspoons baking powder
Filling
- ½ pound skinless, boneless chicken thinghs, finely diced
- ½ cup finely diced yellow onion
- ½ cup finely diced stemmed fresh shiitake mushrooms (about 3 mushrooms)
- ¼ cup fried shallots
- 3 tablespoons canola oil
- 2 tablespoons chopped fresh cilantro
- 1 tablespoons minced scallion, light green part only
- 1 ½ teaspoons finely minced fresh ginger
- 1 ½ teaspoons fish sauce
- 1 teaspoons toasted, ground sesame seeds
- ½ teaspoons kosher salt
- 1 teaspoons oyster sauce
- 1 teaspoons toasted sesame oil
- ¼ teaspoons freshly ground black pepper
- 1 egg white
- 10 3 by 3-inch squares of parchment paper