In a large bowl, combine the ingredients for the patties. Divide the mixture into fourths. Shape them into patties.
16 ounces ground turkey, 1/4 cup breadcrumbs, 2 egg whites, 1/2 tablespoon dried thyme, 1/2 tablespoon dried oregano, 1/2 teaspoon kosher salt, 3.5 ounces feta cheese, 1 teaspoon lemon juice
Preheat the grill to 375 degrees Fahrenheit. Lightly grease the grill. Add the patties and grill for five minutes on each side, or until they reach an internal temperature of 165 degrees Fahrenheit.
While the burgers cook, whisk together the ingredients for the yogurt sauce.
1/2 cup plain low fat Greek yogurt, 4 garlic cloves, 2 tablespoons lemon juice, 1/2 teaspoon kosher salt, 1/8 teaspoon black pepper
Construct the burgers by placing some lettuce on the bottom of the bun. Then add tomatoes, red onion, and cucumber slices. Top with some yogurt sauce (about a tablespoon). Serve and enjoy!