Preheat your oven to 375°F (190°C) and line a small oven-safe baking dish with parchment paper.
Finely mince the garlic clove and roughly chop the fresh dill and green onions.
Place a medium skillet over medium heat, add the fresh spinach and minced garlic, and sauté until the spinach is completely wilted.
Transfer the cooked spinach to a clean kitchen towel and squeeze firmly to remove all excess liquid to ensure the phyllo stays crisp.
In a medium mixing bowl, whisk together the liquid egg whites, Greek yogurt, crumbled feta cheese, dill, green onions, sea salt, and black pepper.
Fold the squeezed spinach into the egg white mixture until the ingredients are evenly distributed.
Lay one sheet of phyllo dough into the prepared baking dish, lightly brush with a small amount of olive oil, and repeat with the remaining two sheets.
Pour the spinach and egg mixture into the center of the phyllo sheets and fold the overhanging edges inward to create a rustic border.
Bake for 25-30 minutes until the egg filling is set and the phyllo dough is golden brown and shatteringly crisp.