01 -  Heat olive oil in a nonstick skillet over medium heat until shimmering. Add finely chopped red onion and sauté for 2 minutes until softened. 
 02 -  Add chopped baby spinach and diced cherry tomatoes to the skillet. Cook for 1 to 2 minutes until spinach wilts and tomatoes soften. 
 03 -  Pour in egg whites, season with salt and black pepper, and gently scramble for 2 to 3 minutes until just set. 
 04 -  Warm each tortilla in a dry skillet or microwave for approximately 20 seconds until pliable. 
 05 -  Evenly divide the egg white mixture between the two tortillas. 
 06 -  Top each portion with avocado slices, cheddar cheese (if preferred), salsa, and chopped cilantro. 
 07 -  Tightly roll each tortilla into a burrito shape. 
 08 -  Serve immediately, or wrap burritos in foil for portability.