recipe twice baked potatoes

Ingredients 4 large baking potatoes (such as russet) 1/4 cup unsalted butter, softened 1/2 cup sour cream 1/4 cup milk 1 cup shredded cheddar cheese, divided 4 slices bacon, cooked and crumbled 2 green onions, chopped Salt and black pepper to taste Optional: chives or parsley for garnish