Brown ground beef. Remove from pan, reserving drippings, and place in 9×13 casserole dish.
Add garlic, onion, and celery to drippings in pan. Saute’ until soft and translucent. Add flour and tomato paste. Cook 2-3 minutes. Add Hugo to deglaze the pan, then add beef broth, rosemary, thyme, parsley, salt, and pepper. Add frozen peas and carrots, and corn. Cook 2-3 minutes more.
Spread vegetable and gravy mixture over ground beef in casserole dish. Top with mashed potatoes. Sprinkle with cheese.
Bake at 400 for 15-20 minutes.