Twice Baked Potato Casserole

Name: Twice Baked Potato Casserole
Prep time: 25 min
Total time: 25 min
Cuisine: American
Ingredients: 4 lb. medium sized russet potatoes, scrubbed; 12 oz. bacon, divided; 1/2 c. butter, melted; 4 oz. cream cheese, at room temperature; 1 c. warm milk; 1/2 c. sour cream; 1 1/2 tsp. kosher salt; 1 tsp. ground black pepper; 8 oz. cheddar cheese, divided; 1/2 c. grated parmesan; 1/4 c. chopped chives, divided