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Preheat oven to 350°F/177°C. Grease and line a 9-inch square pan. Set aside.
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In a bowl, cream butter, add eggs one at a time. Add in the orange liqueur, juice, zest and extract.
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Combine brownie mix, stir until smooth. Pour brownie batter into prepared pan.
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Bake for 20-25 minutes or until brownie is set.
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Serve with candied orange slices.