Combine the dry ingredients in a large bowl by whisking together the flour, yeast, baking powder, sugar, and salt until evenly blended.

Add the wet ingredients into the dry mix and stir until a rough dough begins to form.

Knead the dough on a floured surface for about 10 minutes until smooth and elastic.

Let the dough rise in a lightly oiled bowl for about 1 hour or until doubled in size.

Shape the dough into 10 equal pieces, rolling each into a smooth ball and then into an oval.

Place each folded bao onto baking paper in a steamer and let them rise for 30-40 minutes.

Steam the bao buns for 10 minutes and keep the lid on during steaming.

Let the buns rest for 5 minutes before serving.