Commentary:
Here's a variation on a classic. I love mushrooms & red bell peppers. I brought home some really nice brie cheese from Costco, so I picked up some whole clove garlic bread from King Soopers (one of my favorites), mushrooms and a red bell peppers. This turned out to be dinner - very easy and tasty. This would also be great on pumpernickel or a dark multigrain bread. The bread I used is shaped like a ciabatta loaf, so each slice is about half the size of typical store bread.
Overall this is bombproof simple. Just be careful not to overdo heating it in the oven. The brie melts almost like butter, so if you heat it for more than a couple minutes, it completely melts and disappears into the bread. Otherwise, knock yourself out!