Beat eggs well; add flour sifted with baking powder and salt. Add parsley and cubed cheese. Mix together well. Brown in butter in frying pan, and drop in the batter, a spoonful at a time, to fry. Keep the heat regulated so puffs do not burn. When they are lightly brown, turn carefully, with slotted spoon, without peiercing, and drain on absorbent paper. Serve hot.