Step 1

Preheat the oven to 400 degrees F. Butter a 9-by-13-inch baking dish with the butter.

Step 2

Dice the potatoes and place in the prepared baking dish.

Step 3

Combine the cream and milk in a bowl. Add the flour, salt and pepper. Whisk together until the flour is incorporated. Pour the cream mixture over the top of the potatoes.

Step 4

Cover with foil and bake for 20 minutes. Uncover and top with the cheeses. Bake for an additional 30 minutes. Remove from the oven and allow to sit for 5 minutes. Sprinkle over the chives and serve.