In a small bowl, scramble the egg and egg whites. Season with salt and pepper as desired. Set aside.
1 egg, ⅓ cup liquid egg whites
Lay your tortilla shell on a plate and sprinkle with half of the cheese.
1 soft taco-sized tortilla, ¼ cup shredded cheese
Spray a small non-stick pan with cooking oil and heat to medium. Add diced peppers and onions and saute until soft, about 5 minutes. Add the spinach and lightly stir until wilted. Spread over top of the cheese on the tortilla.
½ cup baby spinach, ¼ cup diced bell peppers, ¼ cup diced onions, ¼ cup shredded cheese
Place the pan back on the stovetop and add the egg. Scramble lightly with a spatula until cooked through. Add eggs to the vegetable and cheese mixture on the tortilla. Sprinkle with the remaining cheese.
Gently up the tortilla by slightly folding in each side, then rolling from the side closest to you. (Watch the video to see how I roll it up without the ends falling out).
Notes
You can prep the vegetables ahead of time and store in the refrigerator for up to 3 days to make morning assembly a little quicker.