The butter for the frangipane should be about the same firmness as the almond paste so the two combine smoothly; otherwise, you will wind up with lumps of almond paste in your frangipane. This tart is best eaten the day it's made.
Not only are these s'mores patriotic, they are customizable. We like having a mix of chocolate bars on hand so guests have a choice. In addition to Norway's Freia milk chocolate, you could also try Ghirardelli dark chocolate with caramel, Ritter Sport praline, and Perugina cappuccino.