01 - Preheat oven to 350°F. Line an 8x8 inch baking pan with parchment paper, leaving enough overhang to lift the bars out later.
02 - Spread walnuts, shredded coconut, and rolled oats evenly across a baking sheet. Toast in the oven for 6–8 minutes, stirring halfway through, until golden and fragrant. Remove and let cool slightly.
03 - Add pitted dates, coconut oil, sea salt, and vanilla extract to a food processor. Pulse until a thick, sticky paste forms and no large date pieces remain.
04 - Transfer the date paste to a large mixing bowl. Add the toasted walnuts, coconut, and oats. Fold together until every piece is evenly coated and well combined.
05 - Press the mixture firmly and evenly into the prepared baking pan, using your hands or the back of a spoon to create a compact, flat layer.
06 - Place chopped dark chocolate in a heatproof bowl set over a pan of gently simmering water (double boiler method), stirring until completely smooth and glossy. Alternatively, melt in the microwave in 20-second bursts, stirring between intervals.
07 - Pour the melted dark chocolate over the pressed date-nut layer. Use a spatula to spread it into an even, smooth coating across the entire surface.
08 - Place the pan in the refrigerator and chill for at least 1 hour, or until the chocolate topping is fully firm and set.
09 - Lift the slab out of the pan using the parchment paper overhang. Place on a cutting board and use a sharp knife to cut into 12 even bars.