1. Preheat your oven to 350°F (175°C) and prepare a muffin tin by spraying it with non-stick cooking spray.
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2. Start by making the brownie batter according to the instructions on the package, using the oil and egg. Set aside.
3. Take your refrigerated cookie dough and divide it into 12 equal portions. Press each portion of cookie dough into the bottom of each muffin tin cup.
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4. Place a Reese’s Peanut Butter Cup on top of the cookie dough in each muffin tin cup.
5. Pour the brownie batter over the peanut butter cups, covering them completely and filling each muffin tin cup.
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