I hesitated. "Why?" I thought. It didn't make much sense to me, and I almost went ahead and used the second mix anyway. But I didn't. Instead, I finished mixing that one little batch and put the cookies in the oven. The package said 8-10 minutes, so I set the timer for 8 minutes. When it went off, I opened the oven door and found - the most burnt food I've ever seen! What on earth?
After some thought, I realized that because it takes me longer than normal to do most everything, I probably shouldn't preheat stuff anymore. And yeah, that mix God had me save for later? It made some beautiful cookies tonight, one of which is in my tummy! :)