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1
In a large, deep mixing bowl pour in lukewarm milk. Stir in the sugar, 2 tablespoons of flour, and the yeast. Let stand for ten minutes.
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2
Then add in the baking powder, salt, vegetable oil, egg whites, and 6 cups of flour. Stir with a wooden spoon until the mixture is well incorporated, you may need to get your hands in there towards the end, and then place the dough onto a lightly floured surface. Knead the dough for 10 minutes. Put the dough in a large bowl, cover it, and let it stand for one hour.
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3
Preheat oven at 375F.
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4
Bring the dough back to your working area and knead it again for another 5 minutes. You want to make sure that all those air bubbles are out.
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5
Form the dough into a log and cut it into 5 or 6 equal pieces. Take one piece (cover the rest with a kitchen towel), and roll it out to a size as big as a medium pizza.
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6
With a knife, cut the rolled out dough into 8 equal slices (as if you were cutting a pie). Place a tablespoon of feta cheese closer to the widest point of the slice. Beginning at the widest point of each slice start rolling it towards the narrowest point.
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7
Place the completed croissants on a lightly greased baking sheet. Continue to do this with the rest of the dough.
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8
In a small mixing bowl, whisk the 4 egg yolks. Brush each croissant with the egg yolk. Top each croissant with sesame seeds. Put 4 or 5 small pieces of margarine throughout the baking sheet.
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9
Bake for 15 to 20 minutes, or until golden brown.
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10
Cover with a kitchen towel while they are cooling.
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11
Serve immediately or store in an airtight container.