Preheat your oven to 400°F (200°C).
In a small oven-safe skillet, heat the extra virgin olive oil over medium heat.
Add the cherry tomatoes and minced garlic to the skillet, sautéing for 3-4 minutes until the tomatoes begin to blister and soften.
Stir in the baby spinach and cook just until wilted, about 1 minute.
In a small bowl, whisk together the liquid egg whites, sea salt, black pepper, and dried oregano, then pour the mixture into the skillet over the vegetables.
Carefully crack the 3 whole eggs onto the surface of the egg white and vegetable mixture, spacing them evenly.
Sprinkle the crumbled feta cheese over the top of the entire skillet.
Transfer the skillet to the preheated oven and bake for 8-10 minutes, or until the egg whites are fully set but the yolks remain jammy and soft.