01 - Line an 8x8-inch baking dish with parchment paper, leaving enough overhang on the sides to easily lift the bars out later.
02 - In a medium saucepan over low heat, combine the peanut butter and maple syrup. Stir constantly for 2 to 3 minutes until fully melted and smooth.
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 it down firmly into an even, compact layer. Place in the freezer for 20 to 30 minutes until completely firm.
05 - Set a heatproof bowl over a pan of barely simmering water. Add the dark chocolate chips and coconut oil, stirring gently until completely melted and glossy.
06 - Remove the frozen peanut butter slab from the dish using the parchment overhang. 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 before placing it onto a parchment-lined tray.
08 - Refrigerate the coated bars for at least 20 minutes, or until the chocolate shell is fully hardened and set.