Oil soften. To do this, take a cup, pour boiling water into it, pour, and cover with a hot cup of butter, soak a couple of minutes. Butter cut into chunks and mix with powdered sugar, then whisk blender until foaming.
Melt the chocolate in a water bath, small portions spread it to the rest of the mass, while continuing to whisk.
Mix the flour with the starch, slowly pour the rest of the ingredients. Knead the dough well. Divide it into small pieces, roll into balls of them.
Prepare the pan: it Cover the parchment, brush with sunflower oil. Preheat oven to 180 degrees. Put the balls on a baking tray, a bit of their primnogo. Put in the oven and bake until done. After cooking, remove cookies, transfer to a platter and sprinkle with sugar.