Boil potatoes in a pot until soft/cooked. Peel once cool enough to handle. Mash while adding milk and half of the butter. Set aside for later.
Cook garlic until golden brown. Using the same pan, cook onions until translucent. Set aside.
Cook ground beef for 15-20 minutes or until brown. Mix cooked garlic, onions and remaining butter. Add carrots and mushrooms. Add spaghetti sauce, green peas, and cubed cheese (leave some to grate and use for topping later). You may also add green bell peppers and cooked spiced ham if you want. Simmer for 15 minutes or until carrots are cooked.
In an oven-safe dish or bowl, put meat sauce and on top of it, layer prepared mashed potato mixture. Sprinkle with grated cheese and pop in the oven for 10 minutes at 350.
