Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Dice the red bell pepper and zucchini into small, uniform cubes. Drain and rinse the black beans.
Toss the peppers, zucchini, and black beans on the prepared baking sheet with avocado oil, sea salt, black pepper, and garlic powder.
Roast the vegetable mixture for 15 to 20 minutes until the vegetables are tender and slightly caramelized at the edges.
While the vegetables roast, whisk the whole eggs and egg whites together in a bowl until the mixture is well combined and slightly frothy.
Heat a non-stick skillet over medium-low heat. Pour in the egg mixture and cook slowly, using a silicone spatula to gently push the eggs toward the center as they set, creating soft curds.
When the eggs are almost fully cooked but still slightly moist, fold in the roasted vegetable and bean mixture.
Transfer the scramble to a plate and garnish with the crumbled feta cheese to serve immediately.