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Preheat & Prep: Preheat your oven according to the brownie mix instructions. Line a 9×13-inch pan with aluminum foil or parchment paper and lightly spray with cooking oil.
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Brownie Base: Prepare the brownie batter as per the box instructions, but reduce the amount of oil by 20%. Pour into the prepared pan and bake. Once done, allow the brownies to cool completely.
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Marshmallow Magic: Gently spread the jar of marshmallow cream evenly over the cooled brownies.
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Chocolate-Peanut Butter Bliss: In a microwave-safe bowl, combine the chocolate chips and peanut butter. Melt in the microwave in one-minute increments, stirring after each minute until smooth.
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Crunch Time: Mix in the Rice Krispies into the melted chocolate-peanut butter mixture until well incorporated.
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Final Assembly: Evenly spread the chocolate-peanut butter crunch layer over the marshmallow layer. Use a spatula to smooth out the surface.
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Chill: Place the assembled dessert in the refrigerator for at least 2 hours to set.
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Slice & Serve: After chilling, remove from the fridge and cut into bars. Serve chilled or at room temperature.
