Place tenderloin on the baking sheet and onto the center rack of the oven. Be sure to have baking sheet in the center 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 center of the tenderloin when cooked will be slightly pink, but will not look raw!