Delicious Chinese Steamed Buns NYT

Ingredients

• 3 ½ cups all-purpose flour (440g)
• 1 packet (2 ¼ tsp) instant yeast (7g)
• ½ cup sugar (100g)
• 1 tsp baking powder
• 1 cup warm water (240ml)
• 3 tbsp vegetable oil (45ml)
• 1 lb ground pork (450g) or tofu for a vegetarian version
• 2 tbsp soy sauce (30ml)
• 1 tbsp oyster sauce (15ml) or vegetarian oyster sauce
• 2 green onions, finely chopped
• 1 tsp sesame oil (5ml)
• 1 tsp fresh ginger, grated
• Salt and pepper to taste
• Parchment paper squares (optional, for steaming)