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To make the dough: Weigh your flour; or measure it by gently spooning it into a cup, then sweeping off any excess. Combine the flour, dry milk, potato flour, sugar, salt, and yeast in a large mixing bowl. Add the butter and lesser amount of water then mix and knead everything together—by hand, mixer or bread machine set on the dough cycle—to form a smooth, elastic dough, adding more water if necessary. If you're kneading in a stand mixer, it should take 7 to 10 minutes at second speed, and the dough should barely clean the sides of the bowl, perhaps sticking a bit at the bottom. In a bread machine (or by hand), it should form a smooth ball.
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Place the dough in a lightly greased bowl. Cover the bowl, and allow the dough to rise, at room temperature, until it's nearly doubled in bulk, about 1 to 2 hours. Rising may take longer, especially if you've kneaded by hand or if your kitchen is cool. Give it enough time to become quite puffy.
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While the dough is rising, lightly grease two 9" round cake pans.
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Transfer the risen dough to a lightly greased work surface, and pat or roll it into a 16"x12" rectangle. It's a nice, soft dough, and pats out easily.
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To make the filling: Combine the sugar, cinnamon, and flour.
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To assemble the rolls: Brush the dough lightly with milk. Sprinkle the filling evenly over the dough, covering the entire surface
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Roll the dough into a log the long way; it'll stretch to about 20" long as you roll. Using a bench knife or a serrated knife, cut the log into 16 slices.
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Space eight rolls in each of the prepared pans. Cover the pans and let the rolls rise until they're noticeably puffy, about 1 to 2 hours; they should spread out and start to crowd one another.
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While the rolls are rising, preheat the oven to 375°F.
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Bake the rolls until they're brown around the edges and beginning to turn golden brown across the center, about 20 minutes.
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Remove the rolls from the oven and place the pans on a rack. Wait 5 minutes, then transfer the rolls from the pans to a rack.
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To make the glaze: When you're ready to serve the rolls, combine the sugar, vanilla, and enough cream or milk to make a spreadable glaze.
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Spread the glaze on top of the warm rolls and serve immediately.
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Store rolls, well wrapped, at room temperature for a couple of days; freeze for longer storage.