01 - Combine eggs, low-fat milk, salt, and black pepper in a mixing bowl and whisk thoroughly.
02 - Heat olive oil in a medium skillet over medium heat. Add red onion and bell pepper; cook for 2 to 3 minutes until vegetables begin to soften.
03 - Add chopped spinach to the skillet and sauté for 1 minute until just wilted.
04 - Lower the heat to low, pour in the whisked egg mixture, and gently scramble using a spatula until eggs are softly set, about 3 minutes.
05 - Stir in chopped cooked turkey or chicken and black beans. Cook for 1 additional minute until heated through.
06 - Sprinkle shredded cheddar cheese over the mixture and stir gently until the cheese melts completely.
07 - Warm whole wheat tortillas in a dry skillet or microwave for approximately 15 seconds until pliable.
08 - Divide the filling between the tortillas. Fold in the sides and roll tightly to secure each burrito.
09 - Serve immediately with salsa on the side as desired.