For a richer flavor, consider using Gruyere or sharp white cheddar cheese. Add a dash of hot sauce or a sprinkle of fresh herbs (chives, parsley) after cooking for an extra touch of flavor. Ensure the jars are fingertip-tight to prevent water from entering during the sous vide process, but not so tight that they crack from the heat. If you don't have mason jars, ramekins covered tightly with foil can work. You may need to adjust cooking time slightly. For meal prep, these can be made in advance and reheated. Reheat gently to maintain texture.