Voni,
There is no point in having a crisp sandwich if you don't follow the basics.
1. White sliced pan only, MUST be fresh.
2. Cheese and onion only. If you use a different flavour you WILL be disappointed.
3. King crisps or, failing that, Tayto.
4. Real butter, 2-4 degrees below room temperature.
If you deviate from these guidelines, neither I nor RAWK will be liable for the consequences...