In a medium bowl, whisk together the whole eggs and egg whites until completely combined and frothy.
Finely mince the fresh chives and stir half of them into the egg mixture along with the sea salt and black pepper.
Heat a non-stick skillet over medium-low heat and melt the ghee, swirling to coat the bottom of the pan.
Pour the egg mixture into the skillet and let it sit for 30 seconds until the edges just begin to set.
Using a silicone spatula, gently push the eggs from the edges toward the center, creating large, soft curds.
Continue cooking slowly, stirring occasionally, until the eggs are mostly set but still look slightly moist and glossy.
While the eggs cook, toast the sourdough bread until golden brown and lightly wilt the spinach in a separate pan with a splash of water.
Plate the creamy eggs immediately, garnishing with the remaining fresh chives, and serve with the toast and spinach.