Preheat your oven to 375°F and lightly grease a 6-inch oven-safe pie dish or skillet with the olive oil.
In a non-stick skillet over medium-high heat, add the ground turkey and cook until browned and crumbled, about 5-7 minutes.
Season the turkey with the sea salt, black pepper, and garlic powder while it cooks.
Add the fresh spinach to the skillet with the turkey and sauté for 1-2 minutes until just wilted, then remove from heat.
In a medium mixing bowl, whisk together the large eggs, liquid egg whites, and dried oregano until the mixture is frothy.
Transfer the turkey and spinach mixture into the prepared pie dish, spreading it out into an even layer.
Pour the egg mixture over the turkey and spinach, ensuring it fills all the gaps.
Crumble the feta cheese evenly over the top of the pie.
Place the dish in the oven and bake for 25-30 minutes, or until the eggs are set and the top is beautifully golden and slightly crisp.
Allow the pie to cool for 5 minutes before slicing into wedges and serving.