01 -
Position rack in center of oven. Preheat to 425°F.
02 -
Toast bread until golden brown. Soak in water until soft and falling apart. Remove, wring out excess water, and tear into small pieces.
03 -
In large mixing bowl, combine bread, meat, onion, garlic, parsley, and egg. Season with cumin, coriander, Urfa Biber, Aleppo pepper, salt, and black pepper. Mix gently but thoroughly with hands.
04 -
Line baking sheet with parchment paper. Form meat mixture into about 18-20 meatballs (2 tablespoons each). Arrange on prepared sheet.
05 -
Bake on center rack until cooked through and no longer pink in middle, 15-20 minutes.
06 -
While meatballs bake, whisk cornstarch with water in medium bowl until dissolved. Add egg and Greek yogurt. Season with salt and pepper. Whisk until well combined.
07 -
Bring broth to boil in small saucepan. Reduce to low simmer and slowly pour yogurt mixture into broth while whisking continuously. Cook, whisking constantly, until sauce thickens, about 1 minute. Remove from heat.
08 -
Warm olive oil in small skillet over medium heat. Stir in Aleppo pepper flakes and swirl until oil turns amber colored. Remove from heat.
09 -
Assemble baked meatballs in shallow bowl, pour yogurt sauce over them, add pickled red onions if using, and drizzle with spicy olive oil.