Scrub potato; prick several times with fork. Microwave at High, turning once, for about 5 minutes or until tender. Wrap in paper towel; let stand 5 minutes. (Or bake potato in 425 F oven or toaster oven for 1 hour or until tender.)
Meanwhile, in small saucepan, heat oil over medium heat; cook onion, asparagus and carrot, stirring, for about 4 minutes or until tender-crisp.