Preheat oven to 400F and set aside sheet tray with a rack.
Place onion, garlic, parsley in food processor. Pulse until fine
In medium bowl, combine ground beef, herb mixture and rest of ingredients. Combine with hands until uniform. Refrigerate 30 min for best results but you can use it right away too.
Slice whole pitas in half so you have 2 half moon shapes. Gently pry open to stuff mixture inside.
Using a spoon, gently fill each pita half with beef mix. Work beef into corners of pita until uniform max 1" thick and the mix is even with the exposed edge of pita.
Lightly brush each side of stuffed pita with EVO.
Place skillet or cast iron over MED HIGH heat, quickly sear each side of pita until just crisp. You can also sear the exposed pita face if the mixture will hold together.
Place seared pitas on sheet tray rack and bake in oven 18-20 min.
Remove and let cool a few min. Slice each half moon in half so a full round pita yields 4 pieces. Serve with yogurt sauce and enjoy!