Cheesy Mashed Potato Casserole

2 lb. Yukon gold potatoes (about 6), peeled, quartered

2 Tbsp.  butter

1/2 cup Sour Cream

1 cup  Shredded Cheddar Cheese

6 slices Bacon, cooked, crumbled

COOK potatoes in boiling water in large saucepan 20 min. or until tender; drain. Return to pan.
HEAT oven to 350ºF. Add butter and sour cream to potatoes; mash until smooth. Spoon half into 1-1/2-qt. casserole; cover with layers of cheese, remaining potato mixture and bacon.
BAKE 30 to 35 min. or until heated through.