HEAT oven to 375ºF.
COOK bacon, onions and peppers in large skillet on medium-high heat 5 min. or just until bacon is crisp, stirring occasionally. Transfer to large bowl.
ADD hash browns, soup, sour cream and 1 cup cheese; mix lightly. Spoon into 13x9-inch baking dish sprayed with cooking spray; top with remaining cheese.
BAKE 40 to 45 min. or until heated through.