For a richer flavor, try using Gruyere or Emmental cheese in place of Swiss. Feel free to add other vegetables like carrots, broccoli, or bell peppers to customize this dish. If you prefer a spicier curry, add a pinch of cayenne pepper or a dash of hot sauce to the sauce. Leftovers can be stored in the refrigerator for up to 3 days and reheated in the oven or microwave.