In a medium bowl, combine the ground chicken, diced red onion, minced garlic, sun-dried tomatoes, baby spinach, chopped dill, dried oregano, kosher salt, and ground black pepper. Mix until well incorporated.

Divide the mixture into four equal portions and shape each into patties about ¾ inch thick.

Heat 2 tablespoons of extra virgin olive oil in a large skillet over medium heat. Add the patties and cook for approximately 5 minutes on each side until golden brown and internal temperature reaches 165°F.

Let cooked patties rest for a couple of minutes. Assemble on a bun or wrapped in butter lettuce, topped with tzatziki, feta, sliced onion, tomatoes, or avocado.