This large stoneware Butter Dish or Cheese Dish will serve you well.  The top fits beautifully in the plate.  There is a rim to contain the butter or cheese, and the plate's rim is large enough to hold a butter knife or small crackers. It is oven and microwave safe, so heating Brie would be perfect.
 
The inside rim of the dish is 5.75" across, and the plate is 7.75."  The lid is 3" high by 7" across.