Cook pasta as directed on package, omitting salt.
Meanwhile, brown meat in large skillet over medium heat. Remove meat from skillet; drain in colander.
Add peppers, garlic and oregano to skillet; cook and stir 3 min. or until peppers are crisp-tender. Add pasta sauce and meat; stir. Bring to boil, stirring occasionally. Spoon into large serving dish.
Drain pasta. Add to pasta sauce mixture; mix lightly. Top with Singles