PREPARE tortellini according to package directions. Reserve 1/2 cup pasta water before draining.
HEAT alfredo sauce and reserved pasta water in skillet. Add cheddar, mozzarella and 1/4 cup parmesan cheese to the alfredo sauce mixture; whisk until combined. Simmer for 1 minute.
ADD tortellini to skillet and toss to combine.
TOP with remaining parmesan cheese and breadcrumbs (optional) when serving.
