Midwestern mashed potato holiday casserole

 When I was a child, every year we would gather together with other midwesterners for holiday potlucks.  My favorite part was always these potatoes.  I see now why, what with all this full-fat deliciousness.  I plan to take this to Thanksgiving this week and found an old recipe card, thank goodness.  

• 10+ potatoes, mashed with milk (we used russets but I got some creamers I'll try with skins; about 4 pounds?)
• 8 oz. cream cheese
• 1 c. sour cream
• 1/4 t. chives
• salt & pepper

Mix well, dot with butter, sprinkle with paprika.  Bake at 350 degrees until hot (about 45 minutes).