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Preheat oven to 350°F.In a large bowl, whisk together Betty Crocker brownie mix, included Hershey's packet, egg, butter, and the amount of water requested on the back of the box. Spray an 8x8 brownie pan with nonstick baking spray. Spread brownie batter into pan. Press mini candy bars into brownie batter, until about halfway impressed into batter.