In a medium bowl, whisk the eggs and Greek yogurt together until the mixture is completely smooth and pale yellow.
Heat a non-stick skillet over medium-low heat and melt the ghee, swirling to coat the bottom of the pan.
Add the fresh baby spinach to the skillet and sauté for 1-2 minutes until just wilted, then remove and set aside.
Pour the egg mixture into the same skillet, keeping the heat low to ensure a soft, custardy scramble.
Use a silicone spatula to gently push the eggs from the edges toward the center, creating large, delicate curds.
Just before the eggs are fully set, fold in the chopped chives, sea salt, and black pepper.
Toast the sourdough bread until golden and crisp.
Layer the wilted spinach and smoked salmon onto the toast, then top with the creamy scrambled eggs.