HEAT oven to 350°F. Lightly crush French Fried Onions in plastic bag using hands or rolling pin.
MIX cheese sauce and milk in greased 2-qt. baking dish. Stir in cooked pasta and 1 cup cheese.
BAKE 25 min. or until heated through. Stir.
TOP with remaining 1 cup cheese and onions. Bake 5 min. until golden.