Sift the flour into a mixing bowl. Mix in the yeast, salt, and baking powder.
Mix in the water to make a dough, and knead it until cohesive and fully combined.
Cover the dough and let rise for 1 hour.
Gently deflate the dough.
Grease a cooking mold, and transfer the dough to the mold.
Cover the mold and place it in a steamer setup. Steam until cooked through and a skewer inserted into the center comes out clean.
Remove from the heat and let cool.
Unmold the steamed bread and serve.