01 - Line an 8-inch square baking pan with parchment paper, leaving a slight overhang for easy removal.
02 - In a food processor, blend the dates until they form a sticky paste.
03 - Add peanut butter, vanilla extract, and salt. Blend until smooth and well combined.
04 - Transfer the mixture to a large bowl. Add crispy rice cereal and mix gently with a spatula until fully incorporated.
05 - Press the mixture evenly into the prepared pan, using another piece of parchment or the back of a spoon to smooth the surface.
06 - Melt dark chocolate and coconut oil together in a heatproof bowl over a pot of simmering water (double boiler) or in the microwave in 20-second bursts, stirring until smooth.
07 - Pour the melted chocolate over the base, spreading evenly.
08 - Sprinkle with chopped peanuts and flaky sea salt, if desired.
09 - Refrigerate for at least 1 hour or until the chocolate is set.
10 - Lift out of the pan and cut into 16 bars. Store in an airtight container in the fridge.