Prepare a steamer. Lightly grease two 3-oz. 12-hole muffin pans and line with cupcake liners. Set aside.

Dissolve yeast in water. Combine flour, sugar and baking powder. Add the dissolved yeast to the dry ingredients and mix. Set aside.

In a bowl, beat egg whites until soft peaks form. Add sugar and continue beating until stiff. Fold in the yeast mixture. Pour into pans then let ferment for 10-20 minutes.

Top with desired toppings. Steam for 10-15 minutes.