01 - Preheat oven to 425°F. Line a rimmed baking sheet with parchment paper and set aside.
02 - In a large mixing bowl, combine the ground turkey, za'atar, minced garlic, grated red onion, parsley, salt, pepper, egg, and breadcrumbs. Mix thoroughly with your hands until evenly incorporated. With damp hands, shape the mixture into 16 to 20 uniform meatballs and arrange them on the prepared baking sheet with space between each.
03 - Bake for 18 to 20 minutes, flipping the meatballs halfway through, until golden brown on the exterior and cooked through to an internal temperature of 165°F.
04 - While the meatballs bake, rinse the rice under cold running water until the water runs clear. Transfer to a saucepan with 2 cups of water and a pinch of salt. Bring to a boil over medium-high heat, then cover, reduce heat to low, and simmer for 12 to 15 minutes until tender. Fluff with a fork and keep covered until ready to serve.
05 - In a small bowl, whisk together the tahini, lemon juice, minced garlic, salt, and 2 tablespoons of water until smooth. Add additional water, one tablespoon at a time, until the sauce reaches a drizzlable, pourable consistency.
06 - Divide the fluffed rice among four bowls. Arrange diced cucumber, halved cherry tomatoes, sliced red cabbage, and sliced red onion over the rice in each bowl. Top with the baked meatballs, drizzle generously with tahini sauce, and finish with crumbled feta, fresh mint, and a lemon wedge on the side. Serve immediately.