Heat a flat pan or griddle over medium heat. Spread half of the cheese between 2 of the bread slices. Brush the outside of the sandwich with 1 tablespoon of the truffle butter and place, buttered side down, on the griddle. Brush the top of the sandwich with 1 tablespoon of the butter. Cook until the underside of the sandwich is golden brown, about 5 minutes. Turn the sandwich over and cook until golden brown on the other side. Transfer to a cutting board and let cool before slicing and serving. 

Repeat with the remaining cheese, bread and butter to make a second sandwich.

NOTE: Marin French Cheese Company Petite Breakfast is a locally produced fresh Brie with a tangy flavor and a slightly spongy texture. If unavailable, your favorite creamy Brie or Camembert cheese can be an appropriate substitute. Black truffle butter can be found in most grocery stores or online.