Finely dice the yellow onion and red bell pepper into small, uniform pieces.
Heat the olive oil in a non-stick skillet over medium heat and sauté the onion and pepper until they are softened and fragrant.
Add the ground turkey to the skillet, seasoning it with the sea salt, black pepper, and garlic powder.
Cook the turkey while breaking it into small crumbles until it is fully browned and no pink remains.
In a small bowl, whisk together the whole egg and egg whites until well combined.
Pour the egg mixture into the skillet with the turkey and vegetables, stirring gently to scramble until the eggs are just set.
Warm the whole wheat tortilla in a separate dry pan over low heat for about 15 seconds per side until pliable.
Slice the avocado into thin wedges and set aside.
Lay the warm tortilla on a flat surface and spoon the turkey and egg mixture into the center.
Top the filling with the fresh avocado wedges and salsa.
Fold the sides of the tortilla inward and roll it up tightly from the bottom to form a burrito.