Preheat your oven to 375°F (190°C).
In a non-stick skillet over medium heat, cook the ground turkey with sea salt, black pepper, garlic powder, and dried oregano until fully browned.
Add the chopped green onion and fresh spinach to the skillet, sautéing until the spinach is completely wilted and any excess moisture has evaporated.
In a medium mixing bowl, whisk together the whole egg, egg whites, nonfat Greek yogurt, and crumbled feta cheese until well combined.
Fold the cooked turkey and spinach mixture into the egg and yogurt base.
Lightly coat a small oven-safe ramekin or individual baking dish with one spray of olive oil.
Gently press the single sheet of phyllo dough into the dish, allowing the edges to drape over the sides.
Pour the turkey and egg filling into the center of the phyllo dough, then fold the overhanging edges back over the top to partially cover the filling.
Bake for 20-25 minutes until the phyllo is golden-brown and the egg filling is firm and set.