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In small bowl, soften 1 1/4 cups hazelnut chocolate spread set over a pan of boiling water for 1 to 2 minutes, stirring constantly. Evenly pour and gently spread over cake; working back and forth to fill holes. (Some hazelnut chocolate spread will remain on top of cake.) Rap baking dish on counter several times to help hazelnut chocolate spread flow down holes. Cool completely, at least 1 hour.