Counterintuitively, it’s the lower temperatures that end up burning the biscuits, while the higher temperature cooks them just right. At lower temps the biscuits must stay in the oven longer to cook through, which exposes the surfaces to more heat, and they end up too dark on the outside, especially the bottom. For even better results, if you have a convection setting on your oven, use that and set the temp to 475 degrees F. Your biscuits will look like they came straight from the drive-thru.