Preheat your oven to 375°F and lightly grease a small oven-safe dish with a tiny amount of olive oil.
In a skillet over medium heat, sauté the minced garlic and chopped spinach in olive oil until the spinach is fully wilted and all moisture has evaporated.
In a medium mixing bowl, whisk together the whole egg, egg whites, sea salt, black pepper, and fresh dill until well combined.
Fold the shredded cooked chicken, sautéed spinach, and crumbled feta cheese into the egg mixture.
Lay one sheet of phyllo dough into the prepared dish, allowing the edges to hang over the sides, then lightly brush with the remaining olive oil before adding the second sheet.
Pour the spinach and chicken egg mixture into the center of the phyllo sheets.
Fold the overhanging edges of the phyllo dough over the filling to create a rustic crust, leaving the center slightly exposed.
Bake for 25-30 minutes until the phyllo is golden brown and the egg filling is firm and set.