Preheat oven to 375°F and line a baking sheet with parchment paper.
Sauté the spinach in a pan over medium heat until completely wilted, then transfer to a clean kitchen towel and squeeze out all excess moisture.
In a large mixing bowl, combine the squeezed spinach, cooked shredded chicken breast, crumbled feta cheese, beaten egg, chopped green onion, dill, sea salt, black pepper, and nutmeg.
Lay one sheet of phyllo dough on a clean work surface and lightly brush with a small amount of melted ghee, then place the second sheet directly on top.
Cut the layered phyllo dough lengthwise into long strips approximately 3 inches wide.
Place a generous spoonful of the chicken and spinach mixture at the bottom of each strip, then fold the corner over the filling to form a triangle.
Continue folding the strip like a flag until you reach the end, then place the triangle on the prepared baking sheet.
Brush the tops of the triangles with the remaining melted ghee and bake for 15-20 minutes until the pastry is golden brown and flaky.