Turn your oven broiler on high. Over medium-high heat melt butter in pan. Add asparagus and roast for 8 minutes. Chop prosciutto and add to pan to crisp for 2 minutes. In a separate bowl mix eggs with salt and pepper. Add eggs to the asparagus and prosciutto and stir to distribute evenly. Cook over medium-high heat for 4 minutes or until the bottom has set. Sprinkle blue cheese over frittata and place in oven for 2-3 minutes for until slightly browned on top. Enjoy!