Step 1

Preheat oven to 325 degrees. Lightly spray a 2 quart casserole dish with cooking spray and set aside. In a small saucepan melt 2 Tablespoons butter over medium heat and which in the flour, salt and pepper. Add the whipping cream and stir for about 2 minutes until it starts to thicken. Add 1/4 cup parmesan cheese.

Step 2

Arrange half of the potatoes in the prepared casserole dish overlapping each other. Spread half of the sauce on top followed by 1/2 cup mozzarella cheese. Repeat with another layer of potatoes and sauce topped with mozzarella cheese and remaining parmesan cheese.

Step 3

Cover with foil and bake for 40 minutes. Uncover and bake for 25-30 minutes more until the potatoes are fork tender and the top is starting to brown. Sprinkle with chives before serving.