Warm the milk until lukewarm, then dissolve the sugar and yeast in it. Let it stand for 10 minutes, or until foamy.
Sift the flour into a large bowl, add the salt and matcha powder, then pour in the yeast mixture and the egg. Begin to knead the dough.
Knead the dough until smooth and elastic, then cover it with a clean kitchen towel and let it rise in a warm place for about 1 hour.
Roll out the risen dough into a rectangle, and place thin slices of 200g of cold butter on it. Fold one half of the dough over the other, then roll it out again and fold it. Repeat this folding process three times, allowing 15 minutes of rest in between each fold.
Mix the heavy cream with a little matcha powder, then let it cool to thicken into a creamy consistency.
After the final roll, cut the dough into triangles. Place a small dollop of matcha cream in the center of each triangle, then roll it up into a croissant shape.
Place the croissants on a baking sheet lined with parchment paper, and let them rise for another 30 minutes.
Preheat the oven to 350°F (180°C). Brush the croissants with a little beaten egg, then bake them for 18-20 minutes, or until golden brown.
When the croissants are baked, let them cool slightly, then sprinkle the tops with powdered sugar and a little matcha powder.
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