Preheat your oven to 165°C (325°F) / 145°C fan / gas mark 3. Prepare two non-stick baking trays. 2. To make the crumble, sift the flour and salt into a large mixing bowl and stir in the demerara sugar. 3.
Add the cold, chopped butter.
Using your fingertips, rub the butter into the flour mixture until it resembles coarse breadcrumbs. Alternatively, you can pulse it in a food processor. 4.
Stir the rolled oats and desiccated coconut into the crumble mixture.
Spread this evenly over one of the non-stick baking trays. 5.
Bake the crumble mix for 20–25 minutes, or until golden brown. Be sure to turn it with a spatula every 10 minutes to ensure it bakes evenly. 6. On the second baking tray, spread out the chopped hazelnuts, peanuts, flaked almonds, and pumpkin seeds. Toast in the oven alongside the crumble for 15–20 minutes, turning regularly until golden and fragrant. 7.
Remove both trays from the oven and allow everything to cool completely on the trays. This is a crucial step for maximum crunch! 8.
Once completely cool, transfer the crumble and toasted nut mixture to a large bowl.
Add the chopped dried apricots, dates, prunes, and raisins, and mix everything together until well combined. 9. Store your finished crumble muesli in a large airtight container for up to 1 month.
Cool Completely: For the ultimate crunchy texture, you must let the crumble base and the toasted nuts cool completely before mixing them with the dried fruit.
Mixing while warm will create steam and can make your muesli soft.