Prepare all ingredients as listed above.
In a nonstick skillet over medium heat, heat olive oil. Add red onion, and bell pepper. Sauté for 4–5 minutes until softened. Stir in cumin, chili powder, salt, and black pepper.
Pour in the eggs and black beans. Scramble until the eggs are firm. Remove from the heat.
Warm whole wheat tortillas in a dry skillet or microwave for 10–15 seconds until pliable.
Portion the egg mixture onto the tortilla. Top with shredded cheese and avocado if using. Fold in the sides and roll up tightly.
Serve burritos with salsa, sour cream, hot sauce, and chopped cilantro if desired, fruit and orange juice.