Put sugar, vanillin sugar, Matcha, icing sugar, salt and butter in pieces in a bowl and whisk until creamy. Add the flour and work into a smooth dough with your hands. Cover and chill for about 30 minutes. Roll out the dough in portions on a floured work surface to a thickness of 5-6 mm, kneading the dough again and again. Cut out fir trees (approx. 6 x 8 cm, 6 x 7 cm and 5 x 6.5 cm). Distribute on 2 baking trays lined with baking paper.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 12-15 minutes one after the other. Let the biscuits cool down. Chop the chocolate coating and melt over a warm water bath. Pour chocolate into a piping bag and cut off a small tip. Spray chocolate "garland-shaped" on the biscuits and sprinkle with sugar decoration. Leave to dry.