01 - Preheat oven to 400°F. Scrub potatoes, poke with fork, rub with olive oil, and sprinkle with salt. Bake directly on rack for 50-60 minutes until tender.
02 - Heat olive oil in large skillet over medium-high heat. Add ground lamb and cook until browned, breaking apart while cooking.
03 - Add onion, carrots, and garlic to skillet. Sauté until soft, 5-7 minutes.
04 - Stir in tomato paste, Worcestershire sauce, thyme, and rosemary. Sprinkle with flour or cornstarch and cook 1 minute.
05 - Pour in stock and simmer until thickened, about 5 minutes. Stir in peas. Season with salt and pepper.
06 - Once baked, cool potatoes slightly. Cut slit and fluff inside with fork.
07 - Scoop potato flesh from each potato into bowl for topping.
08 - Fill each potato with generous amount of shepherd's pie filling.
09 - Mix reserved potato with butter, milk or cream, cheese, salt, and pepper; mash until smooth.
10 - Spoon or pipe mashed potato topping over filled potatoes. Place on baking sheet and broil 3-5 minutes until golden.
11 - Sprinkle with fresh parsley and serve hot.