Beat the eggs in a large bowl until well blended. Heat the oil in a large, preferably nonstick skillet and sauté the scallions about 1 minute. Add the eggs and butter and cook, stirring, until eggs are just cooked, but still soft and creamy. Remove from heat and toss with the tomatoes, Parmesan, and greens. Season to taste with salt and freshly ground pepper. Serve immediately with toasted bread, if desired.