Mince the garlic clove and set aside.
In a medium mixing bowl, whisk together the large eggs, egg whites, Greek yogurt, sea salt, and black pepper until the mixture is smooth and the yogurt is fully incorporated.
Heat the ghee in a large non-stick skillet over medium heat.
Add the minced garlic and baby spinach to the skillet, sautéing for about 1-2 minutes until the spinach is completely wilted.
Lower the heat to medium-low and pour the egg mixture into the skillet over the spinach.
Using a silicone spatula, gently push the eggs from the outer edges toward the center to create soft, creamy curds.
Once the eggs are mostly set but still look slightly moist, sprinkle the crumbled feta cheese over the top and gently fold it in.
Remove the skillet from the heat immediately to prevent overcooking and serve the scramble while warm.