Halve the Ozery Bakery buns and smear one side with mustard. To the other half, add the slices of camembert or brie cheese, along with the mozzarella and a spoonful of cranberry. Place the other half of bread on top.
In a medium skillet, set over medium heat, add the butter. When melted, add the grilled cheeses and cover with a lid. Cook on each side for about 2 to 3 minutes, until golden brown and the cheese is nice and melty. Slice and serve.