Along with serving as its own stand-alone dessert, this Baileys mousse can be used in so many other ways. Here are a few ideas. Use as a cake filling between layers, like in my Irish whiskey chocolate cake. Spoon into an Oreo or graham cracker crust to make a mousse pie. Serve in a dessert glass with layers of crushed chocolate cookies to make a parfait. Spread onto these chocolate stout brownies. Pipe into cupcakes for one decadent filling. Dollop into mini phyllo tart shells to make bite-size desserts.