Let Camembert sit at room temperature for 30 minutes.
Preheat oven to 400°.
Line a rimmed baking sheet with aluminum foil. Spread grapes in an even layer on prepared pan. Drizzle with olive oil; sprinkle with salt and pepper, stirring to coat. Bake for 20 to 25 minutes or until grapes begin to burst but not burn. Allow to rest for at least 5 minutes (grapes will be very hot inside).
Place cheese on a serving dish. Spoon grapes over cheese. Allow to rest for
5 minutes before serving. Serve with flatbread crackers.