I had a sandwich similar to this one a few months ago at a restaurant and in my quest to try to recreate it this is what I came up with. It is so good and so easy. You can add so many different ingredients to it that it's very versatile when serving multiple people.
Ranch Turkey Melt
2 slices Texas Toast
2 slices of turkey breast
1 tbsp. ranch dressing
1 slice of cheese
butter to spread on bread
1.) In a skillet over medium heat add one slice of bread, buttered on the side going down on pan. Add sliced turkey, ranch dressing, and cheese, and top with second slice of bread, buttered on the side that will eventually be turned over.
2.) Allow to brown on each side. You will probably have to turn the heat down some in order to ensure the meat gets warm and the cheese is melted without burning the bread.
Some great additions to this sandwich would be two slices of bacon and a couple of slices of fresh tomato. Neither of which I had on hand but wish that I did. You could also substitute the ranch dressing for thousand island.