Slice the chicken sausage into thin rounds.
In a medium bowl, whisk together the large eggs, egg whites, Greek yogurt, sea salt, black pepper, and garlic powder until smooth and well combined.
Heat the olive oil in a non-stick skillet over medium heat.
Add the chicken sausage to the skillet and sauté for 2-3 minutes until lightly browned.
Add the baby spinach to the pan and cook until just wilted, about 1 minute.
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, creating soft curds.
When the eggs are nearly set but still slightly moist, sprinkle the crumbled feta cheese over the top.
Fold the cheese into the scramble and remove from heat immediately to maintain a creamy consistency.