Preheat oven to 400°F. Generously butter 11x7x2-inch glass baking dish. Whisk first 7 ingredients in medium bowl to blend. Arrange 1/3 of potatoes in bottom of prepared dish, overlapping slightly and covering completely. Pour 1/3 of cream mixture over. Repeat layering potatoes and cream mixture 2 more times. Bake uncovered until potatoes are tender and top is golden brown in spots, about 1 hour 15 minutes. Serve hot.