Spray skillet with non-stick cooking spray and place over medium-low heat.
In a large bowl, whisk egg whites, add salt and pepper to taste.
Add egg whites to skillet and cook for 6 to 8 minutes, folding every few minutes while cooking, or until fluffy. Remove from heat and let cool.
In a large bowl, mix black beans, chili powder and red pepper flakes. Stir until combined.
Warm tortillas in microwave for 10 to 20 seconds, then lay out, and distribute egg whites and black bean mixture evenly on each. Drizzle red enchilada sauce, then tuck in tortilla ends and roll up to make burritos.