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To make the dough: Combine the yeast and sugar in a medium bowl.
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Whisk in the milk, egg yolk, and butter. Allow the mixture to rest for 5 minutes; it should foam and froth.
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Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess. Whisk together the flour and salt in a large bowl.
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Add the milk mixture, and mix and knead until the dough pulls away from the edges of the bowl.
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Continue to knead; by hand or mixer until the dough is smooth and soft, though not too sticky. Shape the dough into a ball, place it in a lightly greased bowl, cover it, and let it rest/rise for 30 minutes to an hour. While the dough is resting, make the filling.
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To make the filling: Mix together the butter, sugar, and cinnamon.
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To assemble the bread: Grease a 10" monkey bread pan or tube pan.
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Gently deflate the dough, then place it on a lightly greased surface and roll it into a rectangle about 18"× 12".
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Spread the filling evenly on top, leaving a clean 1" border around the edges. Top with the berries.
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Starting with a long edge, roll the dough into a fairly tight log; it'll be a bit lumpy because of the berries. Some of the berries will spill out; that's OK, simply set them aside to sprinkle on top once the loaf is in the pan.
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Cut the log in half lengthwise, leaving 1" of one end uncut. Starting at the uncut end, twist the two pieces together to form a log, pressing the ends of the two pieces together to seal. Shape the log into a ring, pressing the ends together to seal.
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Transfer the loaf to the pan, cover, and let it rise for 45 minutes, until it's puffy. While the loaf is rising, preheat the oven to 375°F.
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Brush the loaf with the beaten egg. Bake it for 25 to 35 minutes, until it's golden brown and bubbling.
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Remove the loaf from the oven, and after about 10 minutes carefully transfer it to a rack. Cool it for about 30 minutes before serving.