So, I am a firm believer that american cheese MUST be in a grilled cheese sandwich. If you typically use other cheeses, absolutely still do so, but the next time you make a grilled cheese with cheddar try two slices of cheddar with ONE slice of american in between them. It melts beautifully and adds a creamier texture that cheddar simply cannot give. It will add something special in the middle. I seriously can't recommend this strongly enough, it could change your life >.>