Ingredients
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4 1/2 teaspoons active dry yeast (two 1/4 ounce packages)
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1 1/2 cups warm milk (110°)
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1 pinch sugar
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3/4 cup sugar
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2 large eggs, room temperature
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2 large egg yolks, room temperature
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6 cups all-purpose flour, plus more for work surface
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1 teaspoon salt
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1 cup unsalted butter, room temperature
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butter, for oiling bowl and loaf pans
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36 ounces semisweet chocolate, very finely chopped
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1 cup sugar
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2 1/2 tablespoons ground cinnamon
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1 tablespoon heavy cream
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1 egg
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3/4 cup unsalted butter
Instructions
- Bread Dough: Proof yeast in milk with a pinch of sugar for 5-10 minutes until foamy; whisk sugar, eggs and egg yolks together; add to yeast and whisk.
- Combine flour and salt and stir in egg mixture, mixing thoroughly; cut butter into 1" pieces and beat into flour mixture until dough is smooth and sticky and butter is completely incorporated.
- Scrape dough onto floured work surface and knead until smooth and elastic, about 10 minutes; place in buttered bowl, cover with plastic wrap and allow to double, about 1 hour.
- Filling: Stir chocolate, sugar and cinnamon together; cut butter in; set aside.
- Egg Wash: Whisk egg and cream together and set aside.
- Streusel Topping: Stir sugar and flour together; cut butter in until clumps range in size from crumbs to 1"; set aside.
- Butter three 9"x5"x2 3/4" loaf pans and line with parchment paper; punch dough down and let rest 5 minutes; cut into 3 equal pieces; keep 2 pieces covered with plastic wrap while working on the third.
- On a floured surface, roll the dough out 16" square by 1/8" thick; brush edges with egg wash; crumble 1/3 of the Filling (reserving 2 T) evenly over the dough, leaving a 1/4" border.
- Refresh egg wash if needed; roll dough up tightly, jelly roll fashion; pinch ends together to seal; twist dough evenly throughout the length of the roll a full five or 6 turns; brush top of roll with egg wash.
- Sprinkle the reserved 2 T Filling over the egg-washed top and press in gently so that it doesn't slide off; fold right half of the roll over onto the coated left half; fold ends under and pinch to seal; twist roll two turns and fit into prepared pan; (Loaves may be frozen at this point for up to a month).
- Repeat with the remaining dough and filling; preheat oven to 350°; brush the top of each loaf with egg wash and crumble 1/3 of the Streusel Topping over each; loosely cover with plastc wrap and rest loaves 30 minutes.
- Bake loaves 30 minutes; rotate and bake another 25 minutes until golden; lower heat to 325° and bake another 15-20 minutes or until deep golden; cool in pans on wire rack; remove from pans and serve.
- Baked loaves may be frozen up to one month; if frozen unbaked, let stand at room temperature 5 hours and bake.