Preheat your oven to 190°C (fan). Grease a muffin tray with coconut oil or use a silicone muffin tray.
Add all the nuts and seeds to a large bowl. Pour over the maple syrup and stir well to coat evenly.
Spoon the mixture into the muffin pan compartments. Press each portion down firmly so it compacts — this helps them hold together when baked.
Place on the middle shelf and bake for 20–25 minutes, checking near the end so they don’t overbrown.
Allow them to fully cool in the pan before removing. Once cooled, top with melted dark chocolate or sea salt flakes, if desired.