Butter one side of each slice of bread. Turn over 4 slices and spread mayonnaise on them.
Place 3 slices of bacon, 2 slices of tomato, and 2 Black Diamond Thick Cheddar Slices on each of those 4 slices of bread. Add salt and pepper and cover with the remaining bread, buttered side facing up.
Heat each sandwich in a nonstick frying pan over medium heat or on an electric griddle. Turn once and ensure both sides are toasted and the cheese has melted.