Step 1: Preheat the oven to 400°F (200°C) and prepare a baking sheet by lining it with parchment paper.

Step 2: In a large mixing bowl, combine ground chicken, cumin, oregano, 1/4 cup of the minced dill, chopped mint, diced red onion, 4 cloves of minced garlic, lemon zest, salt, and pepper. Mix until just incorporated—avoid overmixing to maintain tenderness.

Step 3: Form the mixture into meatballs using clean hands or a scoop, and arrange them evenly spaced on the prepared baking sheet.

Step 4: Bake the meatballs for 25-30 minutes, or until they turn golden and are fully cooked (internal temperature should be 165°F).

Step 5: Meanwhile, in a bowl, combine the Greek yogurt, remaining 2 cloves of minced garlic, 1/4 cup minced dill, juice from 1/2 a lemon, olive oil, grated cucumber, salt, and pepper. Stir well until smooth.

Step 6: Serve over romaine with cherry tomatoes, cucumber slices, feta, olives, and a generous dollop of the homemade tzatziki sauce.