Preheat oven to 350° F.
Whisk the milk, heavy cream, pumpkin, dark brown sugar, eggs, pumpkin pie spice, cinnamon and vanilla extract in large bowl to blend. Fold in croissant cubes. Stir in golden raisins.
Transfer mixture to 11” x 7” glass baking dish. Let stand 15 minutes. Bake pumpkin bread pudding until tester inserted into center comes out clean, about 40 minutes.
Meanwhile, prepare caramel sauce:
Melt butter in heavy medium saucepan over medium heat until it is melted.
Add brown sugar and whisk in cream and brandy and stir until sugar dissolves and sauce is smooth, about 3 minutes. Add ¼ cup brandy for a “tipsy” caramel sauce.
Serve pudding warm with caramel sauce drizzled overtop (and whipped cream, if desired!)