INGREDIENTS
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For the dough
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1 1/2 cups warm milk [110°F (43°C)]
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2 (1/4 ounce each) packages active-dry yeast
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3/4 cup plus a pinch granulated sugar
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3 large eggs, at room temperature
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2 large egg yolks, at room temperature
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6 cups all-purpose flour, plus more for the work surface
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1 teaspoon salt
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2 sticks (8 ounces) unsalted butter, cut into 1-inch pieces, room temperature, plus more for bowl and loaf pans
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1 tablespoon heavy cream
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For the filling
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2 1/4 pounds 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 1/2 sticks (6 ounces) butter, cut into 1-inch pieces, at room temperature
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For the streusel topping
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1 2/3 cups confectioners’ sugar
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1 1/3 cups all-purpose flour
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1 1/2 sticks (6 ounces) unsalted butter, room temperature