1 pkg. (32 oz.) ORE-IDA TATER TOTS
1 container (8 oz.) BREAKSTONE'S or KNUDSEN Sour Cream
1/4 cup KRAFT Classic Ranch Dressing
3 Tbsp. chopped fresh chives, divided
1 pkg. (8 oz.) KRAFT Shredded Cheddar Cheese
4 slices OSCAR MAYER Bacon, cooked, crumbled