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Preheat over to 400.
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Melt butter in a small saucepan over low heat. Add brown sugar and stir until melted. Stir in walnuts and cherries. Transfer to a small bowl and allow to cool in refrigerator.
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Unroll puff pastry and place brie round in center. Top with cooled walnut mixture and fold pastry over top. Gently press seals to secure. Combine egg and water, brush over pastry.
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Bake for about 20 minutes or until pastry is lightly browned. Lower oven to 325 and bake for an extra 20 minutes.