Preheat oven to 425°F (220°C).
In a large bowl, combine: ground beef, onion, red pepper, parsley, salt, pepper, crushed red pepper, paprika + cumin. Mix thoroughly until fully combined and slightly sticky.
Lay out lavash or tortillas.
Spread a thin, even layer of the meat mixture across each.
Roll tightly into logs.
Slice into 1.5–2 inch (4–5 cm) pieces.
Thread onto 12-inch (30 cm) skewers.
Place skewers on a parchment-lined tray: Bake 10–15 minutes (bottom gets crispy), flip skewers, bake 5–10 minutes more, broil on HIGH 2–3 minutes until edges are deeply browned.
Mix: yogurt, garlic (powder or fresh), pinch of salt + lemon juice. Let sit 10–15 minutes to mellow.
Spread yogurt on a plate.
Arrange hot kebabs on top.
Finish with fresh lemon juice + parsley.