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Prepare a steamer and 1 oz plastic puto molders or muffin pans.
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Dissolve yeast in water. Set aside until foamy.
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Combine flour, sugar and baking powder. Pour in the dissolved yeast and mix until well blended. Set aside.
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In another bowl, beat egg whites until soft peaks form, add sugar gradually and continue beating until stiff.
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Fold beaten egg whites into the yeast mixture then pour into prepared muffin pans, let it ferment for 10-20 minutes.
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Top with slices of salted egg or cheese.
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Steam for 10-15 minutes.
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Brush with butter before serving.