Preheat oven to 300 degrees F. Line a half sheet pan with parchment.
Measure the oats, nuts, and seeds out into a large bowl.
Combine the maple syrup, olive oil, and ground chia seeds in a measuring cup and let them sit for a couple minutes.
Add the salt, cinnamon, and nutmeg to the oats, nuts, and seeds.
Pour the maple, oil, and chia slurry into the bowl with the rest of the ingredients and stir gently to combine.
Spread the mix out on the prepared baking sheet, making sure to distribute it evenly.
Bake for 30 to 40 minutes, stirring occasionally, until the granola is fragrant and golden brown.
Remove pan from oven, compress the granola with a spatula to encourage clumping, and let granola cool undisturbed for at least an hour.
When granola is fully cool, lift the corners of the parchment to break up the granola into manageable pieces.
Funnel the finished granola into an airtight container to store.
It will keep for at least a couple weeks at room temperature. For longer storage, stash in a ziptop plastic bag and freeze.