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Combine the flour with the salt, sugar and baking powder in a bowl.
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Add the butter and cut into the flour with a pastry blender or 2 knives.
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Beat the egg yolks lightly and combine with the milk.
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Stir into the flour to form a soft dough.
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Wrap in waxed paper and chill for 1 hour.
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Beat the egg whites and fold in the grated cheese and chili powder.
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Roll out the dough as thinly as possible on a floured board.
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Cut the dough into 48 circles with a glass.
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Place 1/3 tablespoon of the cheese mixture on half of the circles and cover with the remaining circles.
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Moisten the edges with a little water and press together.
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Arrange the pastries on a baking sheet and bake in a preheated 375f degree oven for 15 minutes.