Heat the oven to 375°F. Line a small baking sheet or loaf pan with parchment paper.
In a large bowl, combine the ground turkey, egg, breadcrumbs, ¼ cup feta, 1 tablespoon parsley, oregano, garlic powder, salt, and black pepper. Mix gently until just combined.
Shape the mixture into a compact loaf on the prepared baking sheet or press it into the loaf pan. Bake for 35 to 45 minutes, until the center reaches 165°F. Let it rest for 5 minutes before slicing.
While the meatloaf bakes, stir together the olive oil and lemon juice in a medium bowl. Add the cucumber, cherry tomatoes, remaining parsley, and 2 tablespoons feta. Toss gently to coat.
Warm the pita breads in the oven for the last few minutes of baking, or until soft and pliable. Slice the meatloaf and fill each pita with a few slices and some cucumber salad. Serve the remaining salad alongside.