**Prepare the meatball mixture**
In a large mixing bowl, combine the ground turkey, breadcrumbs, egg, parsley, dill, oregano, minced garlic, salt, and pepper. Mix gently until well combined, being careful not to overmix.
**Shape the meatballs**
Using your hands or a small scoop, form the mixture into 1-inch meatballs. You should get about 18–20 meatballs.
**Cook the meatballs**
- **Oven method**: Preheat the oven to 400°F (200°C). Place the meatballs on a baking sheet lined with parchment paper and bake for 18–20 minutes, or until cooked through and the internal temperature reaches 165°F (74°C).
- **Pan-frying method**: Heat olive oil in a large skillet over medium heat. Add the meatballs and cook for 4–5 minutes per side, until golden brown and cooked through.
**Make the tzatziki sauce**
In a small bowl, combine the Greek yogurt, grated cucumber, olive oil, lemon juice, minced garlic, salt, and dill. Stir until smooth and creamy.
**Serve**
Arrange the meatballs on a platter and serve with tzatziki sauce for dipping. Garnish with additional parsley or dill if desired.