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1
Scald the milk by warming it in a pan over medium heat until bubbles form around the edge; remove from the heat and let cool.
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2
Pour the water into the bowl of a stand mixer fitted with a dough hook (or a large bowl fitted with your hands). Sprinkle the yeast in the water and let proof until fluffy, about 5 minutes. Add the cooled milk, sugar, salt, and eggs. Beat in 2 cups flour.
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3
Add the butter, and beat until the butter is broken up into small curds. Beat in 1 more cup flour. Add enough remaining flour to make a soft dough. Let rest for 5 minutes.
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4
Knead (in the mixer or by hand), only adding flour as needed, until the dough is soft and velvety and little blisters appear just under the surface. Put into a large well-greased bowl; turn the dough over to bring the greased side up. Cover with a clean damp towel or plastic wrap. Let rise until doubled in bulk, about 2 hours.
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5
Punch dough down; let rise again for 30 minutes or until almost doubled.
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6
Heat the oven to 350u00b0 F and butter a 9- x 5- x 3-inch loaf pan. In a small bowl, blend the 1/2 teaspoon cinnamon and 1 tablespoon sugar. In another bowl, prepare the filling: mash together the butter, cinnamon and sugars with a fork until a smooth paste forms.
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7
Flatten the dough, seam-side-up, into a rectangle, 8 inches by 12 inches. Spread the cinnamon filling on top, pushing it close to the edges. Roll the dough into a log, tightly sealing the bottom seam, and place seam-side-down in the prepared pan. Loosely cover the dough with plastic wrap and let rest until puffy and nearly doubled in size, about 30 minutes.
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8
Brush the top of the dough with the melted butter. Sprinkle with the cinnamon sugar. Bake until the bread is a chestnut brown and sounds hollow inside when tapped, 45 to 60 minutes. Let cool in the pan for 1 hour then remove the bread from the pan and continue cooling on a wire rack.
