Preheat your oven to 350°F and line a large rimmed baking sheet with high-quality parchment paper.
In a clean glass bowl, whip the egg whites with the cream of tartar and a pinch of the sea salt using a hand mixer until stiff, glossy peaks form.
Gently spread the whipped egg whites onto the parchment paper in a thin, even circle about 8 inches in diameter.
Bake the egg white wrap for 8 to 10 minutes until it is just set and flexible, then remove from the oven to cool slightly.
While the wrap bakes, heat the olive oil in a small skillet over medium heat and add the finely diced sweet potato.
Add the ground turkey and diced red bell pepper to the skillet, breaking the meat apart with a spatula and cooking until browned and the potatoes are tender.
Season the turkey mixture with the garlic powder, onion powder, and the remaining sea salt and black pepper, then stir in the baby spinach until just wilted.
Carefully peel the baked egg white wrap away from the parchment paper, place the turkey and vegetable filling in the center, and roll it up tightly.