Preheat your oven to 375°F (190°C).
Place the cooked spinach in a clean kitchen towel and squeeze firmly to remove all excess moisture.
In a medium mixing bowl, whisk the eggs and nonfat Greek yogurt together until the mixture is smooth and well combined.
Stir in the crumbled feta cheese, chopped scallions, fresh dill, sea salt, and black pepper.
Add the squeezed spinach to the egg mixture, breaking up any clumps with a fork to ensure even distribution.
Lightly brush a small oven-safe skillet or baking dish with a portion of the olive oil.
Lay one sheet of phyllo dough into the dish, brush very lightly with oil, and layer the second sheet on top, allowing the edges to hang over the sides.
Pour the spinach and egg filling into the center of the phyllo sheets.
Gently fold the overhanging edges of the phyllo dough back toward the center, partially covering the filling while leaving the middle exposed.
Bake for 25 to 30 minutes until the phyllo is deeply golden and the center of the pie is firm to the touch.