Preheat the oven to 350 degrees Fahrenheit. Grease an 8×8-inch baking dish with butter. Place the torn bread into the baking dish and sprinkle the raisins over the top.
Bake in the oven for 35-45 minutes, or until the edges are browned. (The center will still look soft.) Serve warm or at room temperature with the bourbon cream sauce over the top.