Grease an 8-inch square pan with cooking spray or butter.

In a medium saucepan over medium-low heat, combine creamy peanut butter, corn syrup, and granulated sugar. Stir for about 3 to 5 minutes until gooey and smooth.

Remove from heat and fold in cornflakes using a spatula for even coating.

Spoon the cornflake mixture into the greased pan and press it firmly into an even layer.

In a microwave-safe bowl, combine chocolate chips and additional peanut butter. Heat in 15-second increments until fully melted.

Pour the melted chocolate-peanut butter mixture over the cornflake layer and spread evenly.

Let cool at room temperature for 10 minutes, then chill in the refrigerator for about 30 minutes.

Once set, cut into squares and serve.