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Preheat oven to appropriate temperature.
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Mix up the brownie batter according to the directions on the box (I added in an extra egg for more cake-like brownies).
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Pour half of your batter into an 8x8 square pan.
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Heat Nutella and caramel sauce in the microwave until they can be easily poured.
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Drizzle Nutella and caramel sauce over the batter in the pan.
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Top with remaining batter.
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Bake according to the directions on the box.