Three-Cheese Chicken & Pasta Skillet

2 cups rotini pasta, uncooked

1 Tbsp.  oil

1/2 cup each chopped green peppers and onions

3 cloves  garlic, minced

3 cups shredded cooked chicken

1 jar  (24 oz.) spaghetti sauce

1/2 tsp. dried oregano leaves

3   KRAFT Singles, quartered

1/2 cup KRAFT Shredded Mozzarella Cheese

1/3 cup  KRAFT Grated Parmesan Cheese 

COOK pasta as directed on package.
MEANWHILE, heat oil in large skillet on medium heat. Add vegetables and garlic; cook and stir 3 min. or until vegetables are crisp-tender. Stir in chicken, sauce and oregano; bring to boil, stirring frequently. Remove from heat.
DRAIN pasta. Add to sauce with Singles; stir. Top with mozzarella and Parmesan; cover. Remove from heat. Let stand 5 min. or until mozzarella is melted.