Bolo Bao (Pineapple Buns)

Name: Bolo Bao (Pineapple Buns)
Prep time: 30 min
Cook time: 9 h 50 min
Total time: 9 h 50 min
Yield: 8 portion
Ingredients: vegetable oil; 140 g milk; 20 g sugar; 1 tsp active dry yeast; 270 g bread flour; 30 g all purpose white flour; 1 egg; ¼ tsp salt; 30 g unsalted butter; neutral oil; 60 g unsalted butter; 60 g sugar; 1 tsp milk powder; 120 g bread flour; ½ egg; bread flour; ½ egg