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Line a baking sheet with parchment paper.
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In a small bowl, mix together the food coloring and water.
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With a mixer, beat together the sugar cookie mix, butter, and the water/food coloring mixture. Beat until well mixed.
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Microwave 2 cups of the white chocolate melts according to the directions on the package.
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Use a spatula to spread the chocolate out (just don't make it too thin!)
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Carefully add the cookie dough to the melted chocolate so you have a layer that is about 1⁄4" thick. Refrigerate for 10-15 minutes.
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Add a second layer of cookie dough so that you have about 1⁄2" thickness.
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Microwave the remaining white chocolate melts according to the directions on the package. Use a spatula to spread the chocolate over the top of the cookie dough.
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Working quickly, top with candies and sprinkles.
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Return to the refrigerator for at least 1 hour. Use a knife to cut the cookie dough bark into pieces. Serve chilled.