In a medium bowl, whisk together the whole eggs, egg whites, sea salt, and black pepper until well combined and slightly frothy.
Slice the chicken sausage into thin rounds.
Heat the ghee in a non-stick skillet over medium heat.
Add the sliced chicken sausage to the skillet and sauté for 3-4 minutes until lightly browned and heated through.
Add the fresh baby spinach to the skillet and toss with the sausage until the leaves are just wilted.
Lower the heat to medium-low and pour the egg mixture into the skillet.
Using a spatula, gently push the eggs from the edges toward the center, allowing them to form soft, tender curds.
When the eggs are nearly set but still slightly moist, sprinkle the crumbled feta cheese over the top.
Fold the feta into the scramble and remove from heat immediately to prevent overcooking.
Serve warm on a plate, garnished with extra pepper if desired.