01 - In a medium mixing bowl, whisk together the eggs, milk, salt, and pepper until fully blended.
02 - Heat the olive oil in a medium skillet over medium heat. Add red onion and red bell pepper, sauté for 2 to 3 minutes until vegetables are tender.
03 - Add chopped spinach to the pan and cook for 1 minute until just wilted.
04 - Reduce heat to low. Pour egg mixture into the skillet and gently scramble, stirring continuously, until the eggs are softly set, about 3 minutes.
05 - Fold in chopped turkey or chicken and black beans; cook for 1 additional minute until heated through.
06 - Sprinkle shredded cheddar cheese over the mixture and stir until melted and evenly incorporated.
07 - Heat each tortilla in a dry skillet or microwave for about 15 seconds until pliable.
08 - Divide the filling evenly between the tortillas. Fold in the sides and roll each tortilla to enclose the filling securely.
09 - Serve the burritos immediately, accompanied by salsa if desired.