Yeah, we know, cupcakes are an almost-perfect dessert. But what would make them even better? Filling! Surprise your party guests with mini cakes filled with berries, cream or pudding. These delicious centers are sure to please, but making them does require a few extra steps. If you're a novice at making cupcakes, consider finding a recipe that uses a boxed cake mix and has a simple procedure for filling each piece. Most recipes for cupcakes with cream or pudding centers have you fill them using a pastry bag after they've been baked. If you don't have a pastry bag on hand, you can use a heavy-duty resealable plastic bag.