Steamed or baked buns appear in many different Asian cuisines. Here is one version of a basic bun.
Mix all yeast mix ingredients in a large mixing bowl.
Let stand for 30 minutes.
Mix other ingredients except baking powder into the bowl in the following order -
Place water in a steamer and bring to a rapid boil.
Reduce heat to medium.
Place a single layer of dough balls (with wax/parchment squares) into steamer tray about 1 inch apart.
Cover and steam for roughly 15 minutes.
Remove cover before turning off heat and transfer buns to a serving plate/tray.
Repeat until all buns are cooked.