Preheat oven to 180 degrees C. Lightly butter a 20x30cm casserole dish.
Cover the bottom of the prepared casserole dish with half of the banana slices. Sprinkle the bananas with half the brown sugar, butter pieces, pecans and raisins. Form another layer with the remaining banana slices and repeat layering with remaining brown sugar, butter, pecans and raisins.
Bake in preheated oven for 30 minutes; remove from oven and cool for 5 minutes. Sprinkle brandy over top of dish to serve.