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 2-3 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 firmly into an even, compact layer. Place in the freezer for 20-30 minutes until completely 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 until completely smooth and glossy.
06 - Remove the peanut butter slab from the freezer and lift it out 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, coating all sides. Tap the fork gently against the bowl to let excess chocolate drip off, then place each bar on a parchment-lined tray.
08 - Refrigerate the coated bars for at least 20 minutes, or until the chocolate shell is completely hardened and set.