Wash the potato, wrap in aluminum foil and bake at 350°F for 60 minutes.
Heat vegetable oil in a pan and cook the beef until it is almost cooked through. Add the onions and garlic.
Pour in the vegetable stock and add the cherry tomatoes, crème fraîche, tomato paste, and mustard. Stir well. Season with salt and pepper and let simmer for 10 minutes.
Once the potato is baked, cut an opening at the top and hollow out with a spoon to make space for the beef.
Fill the hollowed potato with the beef mixture. Sprinkle with crumbled potato chips and grated cheese. Bake at 390°F for 10 minutes.