Start by thawing the frozen spinach and squeeze out any excess moisture using a clean kitchen towel or paper towels.
In a large mixing bowl, combine the ground turkey, Greek seasoning, egg, drained spinach, and crumbled feta cheese. Mix until just combined.
Divide the mixture into equal portions and shape them into patties, making a small indentation in the center of each.
Heat the olive oil in a skillet over medium heat or prepare your grill. Cook the patties for about 5-7 minutes on each side until they reach 165°F.
Let the burgers rest for a few minutes before serving on whole grain buns with your favorite toppings.
