Sauté the butter and green onion until the moisture evaporates, then let cool (do not scorch).
Place all dry ingredients in a bowl and mix well (sift if desired).
Add egg, yogurt, salt, then mix with a spatula, followed by green onion and cheese.
Rest dough in the refrigerator for 30 minutes at 2cm thickness.
Divide into 3 portions.
Bake at 160°C for 10 minutes, then at 150°C for 10 minutes (be careful not to burn).