You're right. I did put a cookie sheet under the pan. This has to be for two layers. Mine overflowed within 5 minutes. I'm hoping it will still turn out. That remains to be seen.
I used a large springform pan, and it baked beautifully. Took a bit of effort to make it pretty-arranging the apples in a pattern, but was well worth the effort. My family loved it
The cake itself was pretty good, a little lackluster. My main issue was with the 9- x 2-inch round cake pan. When I put the batter in the pan it looked like too much but decided it might just not rise as much as I would expect. Oh boy did it rise and spill all over my over. I ended up scooping out half the batter and continuing to bake it. Maybe they meant 2 9 inch round cake pans.