Step 1

Preheat your oven to 375°F.

Step 2

Place the brie cheese in a dish that's just slightly larger than the brie itself. If you don't have something like this, just make sure you leave the rind in tact, and watch the brie as it cooks so it doesn't start melting everywhere.

Step 3

Add the onions, oil, and rosemary to the cheese. Bake for 15-20 minutes.

Step 4

Remove from the oven and drizzle with the balsamic. The cheese should be gooey and melted when you break into it.

Step 5

Serve with crackers and crostini.