01 - Combine eggs, low-fat milk, salt, and pepper in a mixing bowl. Whisk until fully incorporated.
02 - Heat olive oil in a medium skillet over medium heat. Add diced red onion and bell pepper; sauté for 2 to 3 minutes until softened.
03 - Add chopped spinach to the skillet and cook for 1 minute, stirring until just wilted.
04 - Reduce the heat to low and pour in the egg mixture. Gently scramble, stirring, until softly set, about 3 minutes.
05 - Stir in the chopped turkey or chicken breast and black beans. Cook for 1 additional minute to heat through.
06 - Sprinkle shredded cheddar cheese over the mixture and stir until evenly melted.
07 - Heat tortillas in a dry pan or microwave for 15 seconds until pliable.
08 - Divide the filling evenly between tortillas. Fold in the sides and roll tightly to enclose the filling.
09 - Serve immediately with salsa, if desired.