Turkey Provolone Pesto Sandwich Melt (like Costco's!)

I can't think of a single thing to say about these awesomely delicious sandwiches other than they are awesomely delicious. They are a nice change from the standard bread, mayo, meat sandwich that we eat more often for lunch than I would like to admit. Some of the kids had a hard time getting past "the green stuff", but once they tasted them, they were sold!