Preheat oven to 180°C.
Prepare the Basic Cheddar Cheese Sauce (click for recipe).
Place 1 tortilla in the base of a round 6-cup capacity ovenproof dish.
Spread ? pasta sauce over the tortilla.
Cover with ? chicken.
Top with ¼ cheese sauce mixture.
Repeat with 2 more layers.
Top with remaining tortilla and cheese sauce mixture.
Sprinkle Kraft Cheddar Cheese and mozzarella cheese.
Place dish in baking tray and bake for 30 minutes or until cheese is melted and golden and tortillas are tender.
Let it settle for 5 minutes before serving.