Preheat your oven to 375°F (190°C).
Finely chop the fresh spinach and thinly slice the green onions.
In a medium-sized mixing bowl, whisk together the liquid egg whites, whole egg, crumbled feta cheese, chopped dill, sea salt, black pepper, and nutmeg.
Stir the chopped spinach and green onions into the egg mixture until everything is evenly distributed.
Lightly brush a small oven-safe baking dish with a small amount of the olive oil.
Layer the two sheets of phyllo dough into the dish, allowing the edges to hang over the sides, brushing very lightly with olive oil between the layers.
Pour the spinach and egg mixture into the center of the phyllo-lined dish.
Gently fold the overhanging phyllo edges back over the filling to create a rustic, decorative border.
Bake for 25-30 minutes, or until the egg filling is firm and the phyllo is crisp and deeply golden brown.
Remove from the oven and let rest for 5 minutes before slicing and serving warm.