Hot Broccoli-Cheese Dip

pkg. (8 oz.) PHILADELPHIA Cream Cheese , softened

BREAKSTONE'S or KNUDSEN Sour Cream

env. (0.7 oz.) GOOD SEASONS Italian Dressing Mix

pkg. (10 oz.) frozen chopped broccoli , thawed, well drained

pkg. (8 oz.) KRAFT Shredded Cheddar Cheese , divided