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Preheat oven to 350ºF.
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Line a 9x13 inch baking pan with aluminum foil and spray lightly with cooking spray. {Trust me - You want to do this step. It makes clean up so much better.}
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Combine 3/4 cup chocolate chips and butter in a large bowl.
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Microwave on high heat for 45 seconds. Stir and then microwave in 15 second increments and stir again until mixture is smooth.
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Stir in sugars until well combined.
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Add the vanilla extract and stir until smooth.
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Whisk in eggs.
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Fold in the flour until just combined.
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Stir in 1/2 cup chocolate chips and then pour batter into pan.
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Bake for 25 minutes or until center is set.
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Remove from oven and sprinkle chopped peanut butter cups and remaining 1/2 cup chocolate chips over the brownies and continue baking for 3-4 more minutes.
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Remove brownies and let cool.
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Prepare topping by combining peanut butter, chocolate chips and butter in a medium bowl.
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Microwave on high heat for 1 minute. Stir and then microwave in 15 second increments and stir until mixture is smooth.
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Add rice cereal and mix until fully coated.
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Spread cereal mixture in a smooth layer on top of brownies and then cover and refrigerate for at least 90 minutes. {Or overnight.}