Toasted Siopao

Ingredients:
*Dough:
1 cup warm milk
1 medium egg
1/4 cup oil
2 tbsp white sugar
2 tsp instant yeast
3 cups all purpose flour
1/2 tsp salt
*Filling:
Oil
1 medium onion
3 cloves garlic
1/2 kilo chicken breast
1/2 tsp salt
1/2 tsp black pepper
2 tbsp soy sauce
1 tbsp oyster sauce
2 tbsp brown sugar
1 1/2 tbsp cornstarch
1/4 cup water
*Eggwash
1 medium egg
2 tbsp milk
Bake in a preheated oven at 180°C for 20-25mins.