Preheat broiler. Melt butter in heavy broiler proof 10-inch-diameter nonstick skillet over medium heat. Add leeks and sautÃ© 4 minutes. Add asparagus and sprinkle lightly with salt and sautÃ© until tender, about 6 minutes. Add garlic greens. Whisk eggs, 3/4 cup Fontina or cheddar cheese and pepper in medium bowl. Add egg mixture to skillet; fold gently to combine. Cook until almost set. Sprinkle remaining 1/4 cup Fontina or cheddar cheese and Parmesan cheese over. Broil until frittata is puffed and cheese begins to turn golden, about 3 minutes. Cut into wedges and serve.