Preheat oven to 400 degrees.
Line a baking sheet with parchment & set aside.
In a large bowl, combine flour & yogurt & mix well until it forms a smooth ball (you can also use a stand mixer with the dough hook attachment).
Transfer dough to a lightly floured surface & work dough into a large 8-10" disk.
Using a bench scraper or butter knife, cut dough into 4 equal parts.
Roll each piece into a long log - approx 8-10" long.
Shape into a ring & transfer to the prepared baking sheet.
Brush with egg wash.
Sprinkle with onion powder and dried onion flakes.
Bake 20-25 minutes or until golden brown.
Brush with melted butter immediately after removing from the oven.
Store in a closed paper bag. (an airtight container will make them sweat & become too doughy)