4 large white potatoes, peeled, chopped and cooked
2 large sweet potatoes, peeled, chopped and cooked
1 (8 ounce) tub PHILADELPHIA Chive and Onion Cream Cheese Spread, divided
1/2 cup BREAKSTONE’S or KNUDSEN Sour Cream, divided
1/4 teaspoon salt
1/4 teaspoon black pepper
1/4 cup KRAFT Shredded or 100% Grated Parmesan Cheese
1/4 cup KRAFT Shredded Cheddar Cheese, divided