Preheat your Foreman Grill for at least 5 minutes. Use the medium-high setting if your grill has that option.Butter one face of all 4 slices of bread. Turn 2 slices of bread over so that the unbuttered side faces up. Place the cheese on these slices of bread, 2 slices of cheese per sandwich. Place the other piece of bread on top of the cheese with the buttered side facing up.Place the assembled sandwiches on the grill and close the lid. Cook for up to 3 minutes until golden brown with light grill marks and the cheese has melted.Cut the sandwiches in half and serve with potato chips or French fries with ketchup and a pickle wedge.