Line a cookie sheet with aluminum foil and spray or wipe it with olive oil. Lay the chicken filets in the pan and lightly sprinkle salt, pepper and dried rosemary onto both sides. Ya know,, after the salt and pepper you can get creative and spice up the filets any way that YOU want i.e. garlic powder, red pepper flakes, dried basil, paprika, cumin, turmeric and on and on. Tonight we just went with dried rosemary leaves and it worked out real good. Cut the stump ends off of the asparagus spears and then into about 2″ pieces. Cut the potatoes into small chunks and and spread them both around outside of the chicken. Drizzle with olive oil and lightly sprinkle with salt and pepper.