1. Heat oil in a large nonstick skillet over medium heat. Add onion and beef to pan; cook 4 minutes or until onion is tender and beef is browned, stirring to crumble. Stir in chili powder, cumin, and oregano; cook 1 minute. Stir in 2 cups water and remaining ingredients; bring to a boil. Cover, reduce heat, and simmer 18 minutes or until pasta is done.