01 - In a medium mixing bowl, whisk together the eggs, low-fat milk, salt, and black pepper until well combined.
02 - Heat olive oil in a large nonstick skillet over medium heat. Add diced red onion and red bell pepper, and cook for 2 to 3 minutes, stirring frequently, until softened.
03 - Add chopped spinach to the pan and cook for 1 minute until wilted, stirring occasionally.
04 - Reduce heat to low. Pour the egg mixture into the skillet and gently scramble, stirring continuously, until eggs are softly set, about 3 minutes.
05 - Stir in chopped turkey or chicken breast and black beans. Cook for 1 additional minute until heated through.
06 - Sprinkle shredded cheddar cheese over the mixture and stir until fully melted and incorporated.
07 - Warm the whole wheat tortillas in a dry skillet or microwave for 15 seconds to make them pliable.
08 - Divide the prepared filling evenly between the tortillas. Fold in the sides and roll up tightly to seal the burritos.
09 - Serve burritos immediately, with salsa on the side if desired.