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Preheat oven to 375 degrees F.
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Rinse, dry and poke a few holes in the sweet potatoes.
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Bake until tender, about 35-45 minutes.
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When sweet potatoes are cool enough to touch, peel and mash.
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Add melted butter, eggs, cinnamon and 1 cup of flour.
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Mix until combined.
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In the bowl of your mixer, combine sugar, yeast and water.
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Allow to sit and "flower" (until it gets foamy) for 5 minutes.
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When yeast is ready, fit your mixer with the dough hook and add sweet potato mixture.
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Add flour, one cup at a time, until completely incorporated.
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Dough will still be sticky.
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Grease a large bowl with non stick cooking spray (or oil) and place dough inside.
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Cover with a damp cloth and set aside in a warm dark spot.
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Allow to double in size, around 40-60 minutes.
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Once dough has double punch down.
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On a lightly floured surface, roll out dough in the shape of a large rectangle.
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In a bowl melt butter and cool for a few minutes.
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Add brown sugar, cinnamon and flour and mix with a fork.
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Pour filling over dough.
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Starting at 1 long side, roll up dough jelly-roll style, enclosing filling.
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With a sharp knife, or a long piece of unscented/flavored dental floss slice 15 even slices.
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Place in a well greased baking dish, spacing rolls about ¾ inch a part.
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Once again, set the rolls in a warm dark spot and allow to rise for about 30 minutes.
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Meanwhile, preheat your oven to 350 degrees F.
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Once rolls have risen again, bake for about 25 minutes, but double check if a knife comes out clean as all oven are different.
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When rolls are done, let cool for 10 minutes and make your glaze.
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For the glaze, mix together 1 cup powdered sugar, 1 tablespoon milk and 1 teaspoon vanilla extract.
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If glaze is too runny, add more powdered sugar.
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Drizzle or the rolls with a spoon.