Place egg whites, eggs, salt, and black pepper in a large bowl, and stir well with a whisk. Stir in jalapeno, mint (if desired), olives, and beans.
Heat the oil in a large nonstick skillet over medium-high heat. Add Swiss chard and onion; saute 3 minutes or until Swiss chard is tender. Pour the egg mixture into pan; reduce heat to medium-low, and cook 10 minutes or until almost set.
Wrap handle of skillet with foil. Broil egg mixture for 4 minutes or until golden brown.