Mix Dry Ingredients: In a large bowl, combine the flour, baking powder, sugar, and salt. Mix well to ensure the ingredients are evenly distributed.

Add Wet Ingredients: Gradually add the vegetable oil and water to the dry ingredients. Mix until a dough forms. You may need to adjust the amount of water depending on the consistency of the dough.

Knead the Dough: Transfer the dough to a lightly floured surface and knead it for about 5-7 minutes, or until it becomes smooth and elastic.

Rest the Dough: Place the dough back in the bowl and cover it with a damp cloth. Let it rest for 10-15 minutes to allow the gluten to relax.

Divide the Dough: After resting, divide the dough into smaller pieces, depending on the size of siopao you want to make.

Shape the Dough: Flatten each piece of dough into a circle and place a spoonful of your desired filling in the center. Pinch the edges together to seal the filling inside.

Steam the Siopao: Arrange the siopao on a steamer basket lined with parchment paper. Steam them for 15-20 minutes, or until the dough is cooked through.

Serve: Remove the siopao from the steamer and serve them hot. Enjoy!