01 - Line an 8x8-inch baking dish with parchment paper, ensuring the edges overhang for easy removal.
02 - In a medium saucepan over low heat, combine the peanut butter and maple syrup. Stir constantly until fully melted and smooth, 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 into the prepared baking dish. Press firmly and spread evenly across the surface. Place in the freezer for 20 to 30 minutes until completely firm.
05 - Set a heatproof bowl over a pan of gently simmering water. Add the dark chocolate chips and coconut oil, stirring continuously until the mixture is completely smooth and glossy.
06 - Remove the chilled peanut butter slab 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 any excess to drip off. Transfer each coated bar to a parchment-lined tray.
08 - Place the tray in the refrigerator for at least 20 minutes, or until the chocolate coating is fully set and firm to the touch.