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 smoothly combined.
03 - Remove the saucepan from heat and gently fold in the crushed corn flakes, stirring until every piece is evenly coated with the peanut butter mixture.
04 - Immediately transfer the mixture into the prepared baking dish, pressing it firmly and evenly into a uniform 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 the mixture is completely smooth and glossy.
06 - Remove the peanut butter slab from the freezer and lift it out of 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, coating all sides. Tap gently to allow excess chocolate to drip off, then place each 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. Serve chilled or at room temperature.