COOK noodles as directed on package, omitting salt. Meanwhile, combine potatoes, cream cheese spread, onions, 1/2 cup bacon and 1 cup cheddar.
PLACE 3 noodles in 13×9-inch baking dish sprayed with cooking spray; cover with 1/3 of the potato mixture. Repeat layers twice. Top with remaining bacon and cheddar; cover.
BAKE 33 to 35 min. or until heated through, uncovering for the last 5 min. Let stand 10 min. before cutting to serve.