01 - In a medium mixing bowl, whisk together the eggs, milk, salt, and pepper until fully combined.
02 - Heat olive oil in a large nonstick skillet over medium heat. Add diced red onion and bell pepper, and sauté for 2 to 3 minutes until slightly softened.
03 - Add chopped spinach to the skillet and cook for about 1 minute, just until wilted.
04 - Reduce the 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 cooked turkey or chicken breast and black beans. Continue cooking for 1 additional minute to ensure the proteins are heated through.
06 - Sprinkle shredded cheddar cheese over the mixture and stir until melted and evenly distributed.
07 - Warm whole wheat tortillas in a dry skillet or microwave for about 15 seconds until pliable.
08 - Divide the filling evenly between the tortillas, folding in the sides and rolling tightly to form burritos.
09 - Serve immediately with salsa if desired.