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1
Generously grease 2, 9x5 inch bread pans.
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2
In a small saucepan, warm the milk and butter until butter melts.
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3
In a mixing bowl, combine the bread flour, 2 cups all-purpose flour, yeast, and 1/4 cup sugar.
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4
Add water, the milk-butter mixture, egg, and salt to dry ingredients and mix well.
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5
Knead dough until smooth and elastic, about 15 minutes.
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6
Cover dough with a warm, damp cloth and let rise in a warm draft-free area until doubled in size, about 1 to 1-1/2 hours.
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7
For the chocolate filling: In a medium bowl, stir together the finely chopped chocolate, cinnamon, and 1/4 cup sugar.
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8
Cut in 1/4 cup chilled butter.
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9
For the streusel topping: In a medium bowl, combine the powdered sugar and 1/4 cup all-purpose flour.
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10
Cut in 1/4 cup chilled butter until the mixture resembles coarse crumbs.
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11
When the dough has doubled, punch down and cut it into two equal pieces.
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12
Loosely shape each piece into a ball.
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13
Cover the dough with a warm, damp cloth and let it rest for 10 minutes.
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14
Roll out one portion on a lightly floured surface to form a 15 inch square.
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15
Sprinkle with half the chocolate filling, roll up to form a log, and seal the seam and ends.
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16
Twist the dough, like wringing out a towel.
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17
Bring the two ends together, folding the dough in half.
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18
Twist the dough again on itself, in a twisting motion, to form the loaf.
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19
Place loaf in prepared pan, cover with warm, damp cloth and let rise until doubled, about 30 minutes.
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20
Repeat with second dough ball.
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21
Preheat an oven to 350u00b0F.
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22
Brush the loaves with the egg wash, if desired.
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23
Sprinkle streusel on top.
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24
Bake the loaves for 25 to 30 minutes until the bread is a deep golden brown.