In a large bowl, combine olive oil, oregano, garlic powder, salt, and black pepper. Add turkey cubes and toss to coat evenly.
Cover and marinate turkey in the refrigerator for at least 30 minutes.
Thread the marinated turkey cubes onto skewers.
Preheat grill to medium-high heat and cook skewers for 12-15 minutes, turning occasionally, until cooked through.
Meanwhile, prepare the tzatziki sauce by mixing Greek yogurt, grated cucumber, lemon juice, minced garlic, dill, and salt in a bowl. Chill until ready to serve.
Serve grilled turkey skewers hot with tzatziki sauce on the side.
Notes
This recipe is perfect for a quick and healthy dinner. Leftover skewers can be wrapped in pita bread with fresh veggies for a tasty lunch.