Boil potatoes until tender; drain.
Mash potatoes with butter and heavy cream. Stir in herbs/seasoning.
Brown beef; drain and set aside.
Sauté garlic and shallot in olive oil. Add frozen veggies and cook until tender.
Return beef to the pot. Stir in tomato paste and steak sauce.
Slowly add beef broth, simmering until thick.
Layer beef in a baking dish, top with potatoes, swirl with a fork, and add cheese.
Bake at 350°F for 15 mins, then broil for 5 mins.