Preheat your oven to 400°F (200°C) and prepare a small oven-safe skillet or baking dish.
Dice the bell peppers and zucchini into uniform bite-sized pieces, and halve the cherry tomatoes.
On a parchment-lined baking sheet, toss the peppers, zucchini, and tomatoes with olive oil, sea salt, black pepper, and dried oregano.
Roast the vegetables in the oven for 15 minutes until they are tender and just beginning to develop charred edges.
Transfer the roasted vegetables into your oven-safe skillet, spreading them out into an even layer.
In a medium bowl, whisk together the whole eggs and the liquid egg whites until well combined and frothy.
Pour the egg mixture over the roasted vegetables in the skillet.
Place the skillet back into the oven and bake for 12 to 15 minutes, or until the eggs are completely set and the top is lightly golden.
Remove from the oven and garnish with freshly chopped parsley before serving warm.