Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the zucchini, red bell pepper, and red onion into small, uniform bite-sized pieces.
Place the diced vegetables on the baking sheet and toss with 0.5 tbsp of olive oil, sea salt, black pepper, and dried oregano.
Roast the vegetables for 15-20 minutes until they are tender and slightly caramelized at the edges.
While the vegetables roast, whisk the whole eggs and liquid egg whites together in a bowl until fully combined and slightly frothy.
Heat the remaining 0.5 tbsp of olive oil in a large non-stick skillet over medium heat.
Add the baby spinach to the skillet and sauté for about 1 minute until it is just wilted.
Pour the egg mixture into the skillet and cook, stirring frequently with a silicone spatula, until the eggs are soft, fluffy, and just set.
Gently fold the roasted vegetables and the crumbled feta cheese into the scrambled eggs and serve immediately.