I have made this recipe since 1985 with no problems, ever. Tonight I made it and part of it sunk in-just off to the side of the middle. And the edges looked turned in like they rolled over the top. What in the world happened? Of course it is for work tomorrow. I think I will frost it then cut it into servings since I don't know what is under that caved in part. Any ideas? Thanks..Sue
Editing....it is the Denver Chocolate Sheet Cake from Colorado Cache. Made w/ buttermilk, cocoa, eggs, etc. Baked in a jellyroll pan.