Place the pork in a shallow roasting pan coated with cooking spray; arrange the potatoes, carrots and onion around pork. Drizzle with oil. Combine the seasonings; sprinkle over meat and vegetables.
Bake, uncovered, 25-35 minutes or until a thermometer reads 145° and vegetables are tender, stirring vegetables occasionally. Remove pork from oven; tent with foil. Let stand 5 minutes before slicing.