Amazing Twice-Baked Mashed Potato Casserole

Place peeled potatoes in a large pot of water and bring to a boil. Boil until fork tender 20 to 30 minutes.

Preheat the oven to 350 degrees F (175 degrees C). Spray a 3-quart casserole dish with butter spray.

Mash cooked potatoes using a potato masher in a bowl. Add 1/4 cup milk salt and pepper to taste. Depending on consistency add more butter or milk. Stir in sour cream and 1/2 cup Cheddar cheese; mix well. Transfer mixture to prepared casserole dish.

Bake in the preheated oven until heated through about 20 minutes. Top with remaining Cheddar cheese crumbled bacon and chives. Bake until cheese has melted about 5 minutes.