Preheat your oven to 400°F and line a small rimmed sheet pan with parchment paper for easy cleanup.
Dice the bell peppers and zucchini into uniform pieces and spread them across the prepared pan.
Drizzle the vegetables with olive oil and toss to coat evenly before roasting for 10 minutes.
In a medium mixing bowl, whisk together the whole eggs, liquid egg whites, and Greek yogurt until the mixture is smooth and aerated.
Add the sea salt, black pepper, and garlic powder to the egg mixture and whisk once more.
Remove the pan from the oven and scatter the chopped baby spinach over the hot roasted vegetables.
Pour the egg mixture carefully over the vegetables, ensuring they are submerged and distributed evenly across the pan.
Sprinkle the parmesan cheese over the top and return the sheet pan to the oven.
Bake for 12 to 15 minutes until the eggs are fully set in the center and the edges are lightly golden.
Allow the bake to cool for a few minutes before slicing into squares and serving.