Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the chicken sausage into half-inch rounds and dice the bell pepper, zucchini, and red onion into uniform bite-sized pieces.
Place the sausage and vegetables onto the prepared sheet pan, drizzle with avocado oil, and sprinkle with sea salt, black pepper, and garlic powder.
Toss everything together until well coated and spread into an even, single layer.
Roast in the oven for 12-15 minutes until the vegetables are tender and the sausage begins to brown.
While the vegetables roast, whisk together the large eggs and egg whites in a medium bowl until the mixture is smooth and combined.
Remove the pan from the oven, pour the egg mixture evenly over the sausage and vegetables, and return to the oven for another 5-7 minutes until the eggs are set and fluffy.
Divide onto plates and serve immediately while hot.