In lukewarm milk, dissolve the sugar. Crumble the yeast into the milk and let it stand for 10 minutes, until foamy.
Sift the flour into a large bowl, add the salt, then pour in the yeast mixture. Start kneading the dough.
Once the dough comes together, place it on a lightly floured surface and knead for 10 minutes until it becomes elastic.
Place the dough in a bowl, cover with a clean kitchen towel, and let it rise for 1 hour, or until doubled in size.
Roll out the risen dough into a rectangle. Place the cold butter in the center and fold the edges of the dough over the butter to encase it.
Gently roll out the dough, then fold it into thirds. Cover and refrigerate for 30 minutes.
Repeat the folding and rolling process twice more, always resting the dough in the refrigerator for 30 minutes between each fold.
Roll out the prepared puff pastry to a thickness of 5 mm. Cut into triangles and sprinkle with a mixture of cinnamon and brown sugar.
Roll up the triangles from the wide end towards the tip to form croissant shapes.
Place the croissants on a baking sheet lined with parchment paper, cover, and let rise for another 30 minutes.
Whisk the egg and brush the tops of the croissants to give them a shiny glaze.
Bake in a preheated oven at 375°F (190°C) for 15-18 minutes, or until golden brown.
Let the croissants cool slightly before dusting with powdered sugar and serving.
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