Add the beef in a large frying pan over high heat and season with salt and pepper. Cook to brown in some areas, about 5 minutes. Remove excess fat from the pan if needed.
Add the onion and carrot to the pan and continue to cook and stir often to soften the veggies and continue to get some color on the meat. about 8 minutes. Add the garlic and cook 2 minutes. Add the wine and mix. Add the stock, thyme, and corn. Cook 5 minutes.
Mix the cornstarch and water in a bowl until combined. Add about half this mixture to the meat and watch it thicken. Add more if needed to form a thick texture.
When the potatoes are done baking, peel the skin and run them through a potato ricer or mill. Stir in the butter and sour cream to combine. Put into a piping bag.
Preheat broiler to high
Lay out the chips on the pan. Top with half the cheese, then the meat, then more cheese. Pipe on the potatoes evenly.
Broil the chips for 5-8 minutes to brown the potatoes and melt the cheese.
