01 - Line an 8x8-inch baking dish with parchment paper, ensuring the paper extends up the sides for easy removal.
02 - In a medium saucepan over low heat, combine the peanut butter and maple syrup. Stir constantly until melted and well combined, about 2 to 3 minutes.
03 - Remove the saucepan from heat and gently fold in the crushed corn flakes until every piece is evenly coated with the peanut butter mixture.
04 - Immediately transfer the mixture to the prepared baking dish. Press firmly and evenly into the corners. Freeze for 20 to 30 minutes until completely firm.
05 - While the base layer sets, combine the dark chocolate chips and coconut oil in a heatproof bowl set over a pan of simmering water. Stir gently until the chocolate is completely smooth and glossy.
06 - Remove the peanut butter layer from the freezer and cut into 12 even bars using a sharp knife.
07 - Using a fork or dipping tool, submerge each bar into the melted chocolate, allowing the excess to drip off. Place each coated bar onto a parchment-lined tray.
08 - Return the coated bars to the refrigerator for at least 20 minutes, or until the chocolate shell is fully hardened and set.