I often get asked how you get the filling in to the centre of a cupcake. It couldn't be easier. Using a decorating bag with your icing filling and round decorating Tip 230; insert tip in top center of an uniced cupcake and squeeze out a small amount of filling. Or, use the Wilton Dessert Decorator, which includes a filling tip and an easy-to-control cylinder for adding just the right amount. You can't really overfill these - give it a go and you'll see what I mean.
Cut open your cupcake or take a bite and find a yummy surprise! (source http://www.wilton.com/ photograph copyright 2004 Wilton Industries inc).
The options are endless with this technique, fill with lemon curd or other preserve. Cream cheese in carrot cake - so many ideas, so little time!