Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Place the diced bell pepper, zucchini, and red onion on the baking sheet and drizzle with the olive oil.
Sprinkle the vegetables with sea salt, black pepper, and garlic powder, then toss to coat evenly.
Roast the vegetables for 18 to 20 minutes, or until they are tender and starting to brown at the edges.
While the vegetables are roasting, whisk the whole eggs and egg whites together in a medium bowl until the mixture is uniform.
Heat a large non-stick skillet over medium-low heat. Pour in the egg mixture and let it sit for 30 seconds.
Using a silicone spatula, gently push the eggs from the edges toward the center to create large, soft curds.
Once the eggs are almost set but still slightly moist, fold in the roasted vegetables from the oven.
Remove from heat immediately and serve while warm.