I'm sure this receipe had good intentions but my slow cooker didn't agree. I followed the guidelines for only cooking 4.5 hours but this was even too long. I have a newer slow cooker... maybe a year old. I basically stopped it at after 3 hours. I went to take a look at how the lasagna was looking and by then the sides were already burnt. I cooked it on low but I'm thinking warm may be what I need to use next time along with doubling the amount of sauce because it tasted so dry.