Preheat the oven to 325°F / 170°C. Place the oats and hazelnuts on a rimmed baking sheet, trying to keep them as separate as possible, and bake stirring once or twice, until the oats are golden and smell toasty, 12 to 15 minutes. Remove from the oven, let cool, and roughly chop the hazelnuts.
In a small saucepan, melt the coconut oil over low heat. Add the honey, tahini, and vanilla; whisk thoroughly until fully combined.
Roughly chop the dried figs and set aside.
In a large bowl, combine the cooled oats and chopped hazelnuts with the figs, puffed cereal, and salt. Pour the wet ingredients over the dry and stir quickly to mix.
Line an 8x8” brownie pan with plastic wrap or parchment paper. Spoon the mixture in and using slightly damp hands, press it firmly into the pan, especially around the edges and corners.
Combine the hazelnut butter with the ½ teaspoon fine salt and maple syrup – it should transform from runny, into a more solid paste. Spread over the top of the granola bars. Set in the freezer to firm up for at least 4 hours.
When the bars are ready to coat in chocolate, remove them from the freezer and cut the base into 12 even pieces.
Set a double boiler up on the stove, over a low simmer. Chop the chocolate into chunks. Melt in a double-boiler over medium heat. Dip each piece in melted chocolate, then place on a piece of parchment to cool and set. Drizzle remaining chocolate over the top, then sprinkle with a little more flaky salt. Once cool, enjoy! Store bars in the fridge for up to one month, or the freezer for 6 months.