In a medium bowl, whisk together the eggs, egg whites, and Greek yogurt until the mixture is completely smooth and slightly frothy.
Mince the garlic clove finely.
Heat a non-stick skillet over medium-low heat and add the ghee to melt.
Add the minced garlic to the skillet and sauté for about 30 seconds until fragrant but not browned.
Add the fresh baby spinach to the pan and cook, stirring constantly, until just wilted.
Pour the egg and yogurt mixture into the skillet over the spinach.
Allow the eggs to set for a few seconds, then use a silicone spatula to gently push the curds from the edges toward the center.
When the eggs are nearly set but still look moist, sprinkle in the crumbled feta cheese, sea salt, and black pepper.
Continue to fold the eggs gently for another 30 seconds until the cheese is warm and the eggs reach a creamy, soft consistency.
Remove from heat immediately and serve while warm.