In a large mixing bowl, combine the ground turkey, whole wheat breadcrumbs, grated Parmesan cheese, finely chopped onion, minced garlic, egg, chopped oregano, salt, black pepper, and ground cumin. Use your hands to mix until the ingredients are thoroughly combined and the mixture is cohesive.
With your hands, shape the mixture into meatballs, roughly 1 inch in diameter. You should expect to yield approximately 18-20 meatballs.
Heat a large skillet over medium heat and add a generous drizzle of olive oil. Wait until the oil is hot and shimmering before carefully placing the meatballs into the skillet. Be sure not to overcrowd the pan; you can cook them in batches if necessary.
Sear the meatballs for about 5-7 minutes on each side, or until they develop a golden brown crust and are cooked all the way through (the internal temperature should reach 165°F). Once cooked, transfer the meatballs to a plate lined with paper towels to absorb any excess oil.
To prepare the tzatziki sauce, in a medium-sized bowl, mix the Greek yogurt, shredded cucumber, lemon juice, chopped dill, and a pinch of salt. Stir well until the mixture is smooth and even.
Serve the meatballs warm, either drizzled with tzatziki on top or alongside it, allowing everyone to enjoy as much tzatziki as they prefer.
Notes
Serve with warm pita bread and a vibrant side salad for a complete meal experience.