Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Slice the chicken sausage into 1/2-inch thick rounds and place them directly onto the prepared sheet pan.
Add the diced red bell peppers and red onions to the pan with the sausage.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, and garlic powder.
Toss the ingredients together with your hands or a spatula until evenly coated, then spread them out into a single layer.
Roast in the oven for 12 minutes until the vegetables are tender and the sausage is lightly browned.
While the vegetables roast, whisk the large eggs and liquid egg whites together in a medium bowl until well combined and frothy.
Remove the pan from the oven and carefully pour the egg mixture over the roasted sausage and vegetables.
Return the pan to the oven and bake for an additional 5 to 7 minutes, or until the eggs are just set and no longer liquid.
Use a spatula to gently break up and scramble the eggs directly on the pan, garnish with chopped fresh parsley, and serve immediately.