Preheat your oven to 375°F (190°C).
Thaw the frozen spinach completely and place it in a clean kitchen towel, squeezing forcefully until all excess moisture is removed and the spinach is dry.
In a medium bowl, whisk together the liquid egg whites, the whole egg, crumbled feta cheese, green onions, fresh dill, sea salt, black pepper, and nutmeg.
Stir the squeezed spinach into the egg mixture until well combined.
Lightly melt the ghee and brush a small oven-safe ramekin or individual baking dish with a tiny amount.
Layer the two phyllo sheets into the dish, allowing the edges to overhang, and lightly brush the top sheet with the remaining ghee.
Pour the spinach and egg mixture into the center of the phyllo, then fold the overhanging edges loosely over the filling.
Bake for 30 to 35 minutes until the egg filling is set and the phyllo is deep golden brown and crisp.