Preheat the oven to 325F. Line a baking sheet with parchment.
In a bowl, combine the almonds, cashews, pumpkin seeds, chia seeds and coconut flakes. Toss until combined.
Pour in the maple syrup, vanilla, olive oil and salt and toss again. Allow to sit for 5 minutes for the chia seeds to thicken.
Transfer the mixture to a baking pan. Using the back of a spoon or spatula, form an even layer, ensuring it’s compact. Place in the oven for 25 to 30 minutes, until golden brown.
Remove the pan from the oven and allow it to cool completely for at least an hour before slicing. Transfer the slab to a cutting board, and carefully slice into 16 bars. Microwave the chocolate and coconut oil, and drizzle over the bars, if desired.
Store in an airtight container in the fridge for up to 4 days.