1. Place brandy, raisins, and currants in a small bowl. Microwave on 100% power until raisins absorb brandy, 30 to 60 seconds.
2. Place Brie in a microwave-safe serving dish. Microwave on 100% power until cheese is warmed and begins to melt (30 to 60 seconds). Sprinkle raisins and walnuts on top of Brie.