HEAT oven to 400ºF.
COOK cream cheese spread, broth and milk in saucepan on medium heat until cream cheese is melted and mixture comes to boil, stirring constantly with whisk.
RESERVE 2 Tbsp. bacon bits. Layer half each of the potatoes, onions and remaining bacon bits in 13x9-inch baking dish sprayed with cooking spray; repeat layers. Add cream cheese sauce; cover.
BAKE 1-1/2 hours or until potatoes are tender and top is golden brown, uncovering and topping with shredded cheese and reserved bacon bits for the last 10 min.
serving size = 1/2 cup (125 mL)