Sauté the butter and green onions until moisture is gone, then let cool (do not burn).
Add all dry ingredients to a bowl and mix (sift if needed).
Combine egg, yogurt, salt, and add to the bowl with spatula along with green onions and cheese.
Shape dough to 2cm thickness, refrigerate for 30 minutes.
Cut into 3 pieces.
Bake at 160°C for 10 minutes, then 150°C for 10 more minutes (watch to avoid burning).