Butter the bread. While the pan heats, butter one side of each slice of bread.
Prepare your bread. Place one side of the bread butter side down on a non-stick clean surface (or in your skillet). Sprinkle half of the cheese onto the unbuttered side of the bread followed by the guacamole, bacon, tortilla chips, and the remaining cheese, and top with the remaining slice of bread, buttered side up.
Grill. Transfer your sandwich to your skillet and grill until golden brown (about 2-4 minutes.)
Flip and serve. Use a spatula to flip and cook until golden on the opposite side and the cheese is melted. Serve immediately.