Preheat oven to 425°F. Pull out a sheet pan large enough to fit both flatbreads or two small sheet pans.
On each flatbread: spread 1 tablespoon mascarpone and 3 ounces of brie - you will need to break the brie into smaller pieces. Sprinkle with ¼ cup cranberries and half the full amount of fresh chopped rosemary.
Bake for 9 to 11 minutes until the cheese is browned, gooey and the bottom of the flatbread is crisp.²
