Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Dice the bell peppers and zucchini into bite-sized pieces, then place them on the baking sheet along with the cherry tomatoes.
Drizzle the vegetables with avocado oil and season with sea salt, black pepper, and dried oregano, tossing well to coat evenly.
Roast the vegetables for 15-20 minutes until they are tender and show slight caramelization on the edges.
In a medium mixing bowl, whisk together the whole eggs and liquid egg whites until the mixture is uniform and slightly frothy.
Heat the ghee in a large non-stick skillet over medium-low heat.
Pour the egg mixture into the skillet and let it sit for 30 seconds before gently stirring with a silicone spatula to create soft curds.
Continue cooking the eggs slowly, stirring occasionally, until they are mostly set but still look moist.
Gently fold the roasted vegetables and crumbled feta cheese into the eggs.
Remove from heat immediately and serve while the eggs are warm and the cheese is just beginning to soften.