Ruhlman says he simply places a glass cup or ramekin in the middle of a cake pan before pouring the batter inside. If the glass slides away from center, it's easy enough to reposition it right after you set the cake on the oven rack.
A cake pan is about half the size of a bundt cake pan, so you can usually make two cakes from one bundt cake recipe. You can also try using a high-sided spring form pan in place of the cake pan.
The edges of the cake will be a little more square than is typically for a bundt cake. If this is an issue for you, you can trim the corners into the traditional tube with a serrated knife before you frost it.
We think this is a great solution for someone who only makes the occasional bundt cake or lacks the room to keep one of the tins! What about you?
Related: Sweet Gift Idea: Cake in a Jar
(Image: Emma Christensen)