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Place the flour in a bowl. Make a well in the middle of the flour.
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Add 3 tablespoons of the lukewarm milk and sprinkle the yeast into the milk.
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When the yeast dissolves, add the sugar and rub the mixture between your hands to distribute the yeast.
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Cover the bowl and let stand in a warm place for 15 minutes.
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Add the melted butter, the rest of the milk, egg, and salt and knead together into a smooth dough.
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Cover the bowl once again and let stand for 15 minutes.
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Line a 10"x14" sheet pan with baking paper. Grease the sides.
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Roll out the dough into a rectangle, transfer it to the pan, and spread it out to the edges.
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Let stand for 20 minutes.