Preheat your oven to 375°F and lightly grease a small oven-safe baking dish with a touch of oil.
Place the thawed spinach in a clean kitchen towel and squeeze firmly until all excess moisture is removed to ensure a crisp crust.
In a medium mixing bowl, whisk together the eggs, liquid egg whites, crumbled feta, sliced green onions, chopped dill, minced garlic, sea salt, and black pepper.
Stir the thoroughly squeezed spinach into the egg and cheese mixture until the ingredients are evenly distributed.
Lay one sheet of phyllo dough into the prepared baking dish, allowing the edges to hang over the sides, and lightly brush with half of the olive oil.
Place the second sheet of phyllo on top, rotating it slightly to cover the corners of the dish, and brush with the remaining olive oil.
Pour the spinach and egg filling into the center of the phyllo sheets, spreading it out evenly.
Fold the overhanging edges of the phyllo dough loosely toward the center, creating a rustic border while leaving the middle of the filling exposed.
Bake for 30 to 35 minutes until the egg filling is fully set and the phyllo pastry is golden-brown and exceptionally flaky.