Dice the sweet potato, bell pepper, and red onion into small, uniform pieces to ensure even cooking.
Heat the olive oil in a large non-stick skillet over medium heat.
Add the diced sweet potatoes and sliced chicken sausage to the skillet, cooking for 8-10 minutes until the potatoes are tender and the sausage is browned.
Stir in the bell peppers and red onion, sautéing for another 3-4 minutes until the vegetables are slightly softened.
In a small bowl, whisk together the large eggs and egg whites with sea salt and black pepper.
Pour the egg mixture over the ingredients in the skillet, reducing the heat to medium-low.
Gently fold the eggs into the mixture using a spatula until they are mostly set.
Add the fresh spinach to the skillet and continue to fold for 1 minute until the leaves are wilted and the eggs are fully cooked.
Serve immediately while hot.