Preheat the oven to 350 degrees. Coat a 3-quart casserole dish with nonstick cooking spray. In a large bowl, combine the mashed potatoes, 1-1/2 cups mozzarella cheese, the sour cream, bacon bits, 1 tablespoon dried chives, and the pepper; mix well. Spoon into the casserole dish and top with the remaining 1/2 cup mozzarella cheese. Bake for 25 to 30 minutes, or until heated through and the cheese is golden. Sprinkle with the remaining 1 tablespoon chives and serve. 6 to 8 servings
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