1) Tear off a sheet of wax paper large enough for your pan. I’m using mini ones here, so one little strip is enough for all three. If you’re using regular-sized pans, it’s easier to do one square per pan.
2) Trace around the outside of the pan with a pen. It doesn’t matter if the pen actually works, and I’ve even used the point of the scissors, because you can see the scratch mark. (I didn’t take a picture of the drawing, because I don’t have a third hand. You need one to trace and one to hold the pan in place.)
3) Cut out your shapes.
4) “Glue” them into place with a squirt of Pam or brush of shortening (whatever you normally use).
5) Pour in your batter, bake, cool for 5-10 minutes, then flip them over and remove the cakes from the pan. Peel off the wax paper and throw it away. That’s it! (You can find the recipe I used for the cake here.)