Assemble recipe as directed but do not sprinkle with bacon and onions; cover with heavy-duty foil. Freeze up to 1 month. When ready to serve, thaw overnight in refrigerator. Bake, covered, 1 hour or until heated through, uncovering the last 10 min. Sprinkle with bacon and onions.
Use any savory flavor of PHILADELPHIA Cream Cheese Spread to season the potatoes. Or, roast fresh garlic and add to the potatoes for creamy garlic mashed potatoes.
Sprinkle baked casserole with OSCAR MAYER Real Bacon Bits, chopped chives and/or KRAFT Grated Parmesan Cheese instead of the suggested toppings.