Chop half apple into small pieces. Add to a bowl with tuna, Miracle Whip, salt & pepper. Mix to combine well.
Heat frying pan on medium heat. Butter one side of all 4 pieces of Cinnamon raisin bread. Place bread in pan butter side down. Add 1 slice of Kraft cheese to bread. Then add half of tuna apple mixture on top of cheese. Add second slice of cheese on top of tuna apple mixture. Top off with second slice of bread butter side up.