My grandmother's [well, probably Kraft's recipe, probably] cheesecake recipe included a sour cream layer added toward the end of the baking. Hid any cracks. Tasted good, too.
I like the paring knife trick. Do you remove the springform sides, too, while it cools? Or will the cake slump too much in the cooling?
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"Enjoy every sandwich."
-Warren Zevon