Thank you Mimi for this recipe. It beats all the other recipes I've tested (over a dozen). I've tried your original recipe but after tasting the recipe with buttermilk versus sour cream, we switched to sour cream. I can't remember if the original recipe created this type of crust.
I test my oven regularly but maybe I should look at it again.
I use a professional cake release spray.
Maybe I'll try the Wilton bake-even strips....that I have somewhere in my kit.