Place tenderloin on the baking sheet and onto the centre rack of the oven. Be sure to have baking sheet in the centre of the rack. Allow to bake for 20-30 minutes. Oven temperatures may vary, so use an internal thermometer to check for doneness. If it reads 140° F-150° F it is done. If you do not have an internal thermometer, the centre of the tenderloin when cooked will be slightly pink, but will not look raw!