Preheat your oven to 375F (190C) and lightly grease a small baking dish with a drop of olive oil.
Place the fresh spinach in a large skillet over medium heat and cook until completely wilted, then transfer to a clean kitchen towel and squeeze out every drop of excess moisture.
Finely chop the squeezed spinach and place it in a medium mixing bowl.
Add the crumbled feta, whole egg, egg whites, Greek yogurt, chopped scallions, fresh dill, sea salt, black pepper, and a pinch of nutmeg to the spinach.
Stir the mixture thoroughly until the eggs and greens are well combined into a thick filling.
Lay one sheet of phyllo dough into the baking dish, letting the edges hang over, and lightly brush with half of the olive oil.
Place the second sheet of phyllo on top, rotating it slightly to cover more surface area.
Pour the spinach and egg mixture into the center of the phyllo sheets and spread it evenly.
Fold the overhanging edges of the phyllo dough over the top of the filling, leaving the center slightly exposed, and brush the top with the remaining olive oil.
Bake for 30 to 35 minutes until the phyllo is deeply golden brown and the egg filling is set and firm to the touch.
Allow the pie to cool for 5 minutes before slicing to ensure the layers stay crisp.