1 butternut squash (2 lb.), peeled, cut into 1-inch cubes
1 onion, cut lengthwise in half, then sliced crosswise
1/2 tsp. crushed red pepper
3-1/3 cups rigatoni pasta, uncooked
4 oz. (1/2 of 8-oz. pkg.) PHILADELPHIA Cream Cheese, cubed, softened
1 pkg. (8 oz.) KRAFT Shredded Three Cheese with a TOUCH OF PHILADELPHIA, divided
1/4 cup croutons, crushed