01 - Line an 8x8-inch baking dish with parchment paper, ensuring the paper extends over the edges for easy removal.
02 - In a medium saucepan over low heat, combine the peanut butter and maple syrup. Stir constantly until melted and fully incorporated, about 2-3 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 - Transfer the mixture into the prepared baking dish and press firmly into an even, compact layer. Place in the freezer for 20-30 minutes until set and firm.
05 - Set up a double boiler by placing a heatproof bowl over a pan of gently simmering water. Add the dark chocolate chips and coconut oil, stirring continuously until completely smooth and glossy.
06 - Remove the frozen 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, coating all sides. Allow excess chocolate to drip off before placing each bar onto a parchment-lined tray.
08 - Place the coated bars in the refrigerator for at least 20 minutes, or until the chocolate shell is fully hardened and set.