Spray frying pan with Pam and heat on medium high. To make sandwich place two slices of cheese on one slice of bread. Place sliced avocado and bacon on top of cheese. Place remaining slices of cheese on top of bacon and finish with second slice of bread. Using 1/2 the softened butter, butter the top slice of bread and place buttered side down in heated pan. Reduce heat to medium and cook until golden and cheese begins to melt. Butter top slice of bread and flip sandwich. Cook until golden brown, about 2 minutes.