Place the turkey bacon in a non-stick skillet over medium heat and cook until browned and crispy, then set aside on a paper towel.
In the same skillet, add the fresh spinach and sauté for 1-2 minutes until wilted, then remove from the pan.
Pour the egg whites into the skillet and scramble over medium-low heat until fully set and fluffy.
Warm the whole wheat tortilla in a separate dry pan or microwave for 15 seconds to make it pliable.
Layer the scrambled egg whites, crispy turkey bacon, sautéed spinach, sliced avocado, and crumbled feta cheese in the center of the tortilla.
Fold in the sides of the tortilla and roll tightly to form a burrito.
Optional: Place the rolled burrito back in the hot skillet for 30 seconds per side to get a golden, toasted exterior.
Serve immediately with a side of mild salsa for dipping.