Preheat oven to 325 degrees. Grease 9 x 13 baking dish. In large bowl, stir together half & half, cream, salt and pepper. Add potatoes and toss to mix and coat evenly. Layer 1/4 potatoes in dish. Evenly scatter 1/4 cheeses over potatoes. Repeat to make 3 more layers, pressing with your palm if necessary to fit potatoes in dish. Reserve a final sprinkling of cheese. Pour any cream mixture remaining in dish over potatoes. Sprinkle remaining cheese. Scatter butter pieces over cheese. Bake until top is browned, the cream thick and bubbling about 1 1/2 hrs. Let rest 10 min. before serving.
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