Spray a large non-stick fry pan with non-stick cooking spray. Saute the onion for a couple of minutes till tender. Add eggs and cook and stir over medium-low heat. Season the eggs with salt and stir frequently as they cook. Just before the eggs are completely set, add the well drained black beans. Cook and stir just till beans have warmed and eggs are fully cooked. Sprinkle with cheese and remove from heat. Stir until cheese is melted and well incorporated.

Sprinkle individual servings with optional garnishes - additional chopped green onion, a dollop of sour cream, sliced avocado and salsa.