Definition of «cupcake corer»

A cupcake corer is a tool used to remove the center of a cupcake, making a hollow space inside.

I used an apple corer but you can also find cupcake corers. (wallflowerkitchen.com)
To assemble, use a sharp knife or specialist cupcake corer to make a circular incision in the center of each cupcake, remove the center and fill each one with a teaspoon of the chocolate filling. (epicurious.com)
If you have a fancy store bought cupcake corer you may use that. (graciouslysweet.com)
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