In lukewarm milk, dissolve the sugar, then crumble in the yeast. Let it stand for 10 minutes until foamy.
In a large bowl, sift the flour, add the salt, and then pour in the yeast mixture. Start kneading the dough until it becomes smooth.
Divide the dough into three equal parts. Leave one part plain, mix cocoa powder into the second part, and matcha powder into the third.
Place all three doughs into separate bowls, cover with a kitchen towel, and let them rise for 1 hour, until doubled in size.
Roll out each of the risen doughs separately into a rectangle shape, then layer the plain, cocoa, and matcha doughs on top of each other.
Gently roll out the three-layered dough so that they stick together, 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 in between.
Roll out the finished tricolor dough to a thickness of 5 mm, then cut into triangles.
Roll up the triangles from the wide end towards the tip to create a croissant shape.
Place the croissants on a baking sheet lined with parchment paper, cover, and let them rise for another 30 minutes.
Whisk the egg and brush it over the top of the croissants to give them a nice shine.
Bake in a preheated oven at 375°F (190°C) for 15-18 minutes, or until golden brown.
Let the croissants cool, then sprinkle with powdered sugar before serving.
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