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Prepare a steamer and several small muffin pans.
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Dissolve yeast in water.
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Combine flour, sugar and baking powder.
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Pour in dissolved yeast. Set aside.
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In a bowl, beat egg whites until soft peaks form. Add sugar and continue beating until stiff. Fold in the yeast mixture.
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Pour into pans then let ferment for 10-20 minutes. Top with slices of salted egg or grated cheese.
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Steam for 10-15 minutes. Brush with butter before serving.