Preheat your oven to 400°F.
Chop the red bell pepper, zucchini, red onion, and cherry tomatoes into bite-sized pieces.
In a large, oven-safe skillet, heat the olive oil over medium heat.
Add the chopped red onion and garlic powder, and sauté for about 2 minutes until fragrant.
Add the lean ground turkey to the skillet. Cook until it is browned and crumbled, about 5-6 minutes, stirring occasionally.
Mix in the red bell pepper, zucchini, and cherry tomatoes. Season with salt and pepper.
Transfer the skillet to the preheated oven and roast the vegetables with turkey for about 10 minutes until they are tender.
Meanwhile, in a separate non-stick pan, warm the egg whites over medium-low heat, stirring gently until just set.
Once the skillet is done, remove it from the oven and stir in the fresh spinach until wilted.
Plate the roasted turkey and vegetable mixture, then top with the warm egg whites. Serve immediately.