Preheat the oven to 160°C (320°F) and line a large baking sheet with parchment paper.
Combine the oats, almonds, chia, arrowroot powder, and salt in a large bowl.
Add the maple syrup, almond butter, coconut oil, and vanilla to the bowl. Mix very well using a spatula or wooden spoon.
Spread evenly onto the prepared baking sheet and bake for 20-25 minutes, stirring or turning the sheet at the halfway mark if your oven bakes unevenly.
Cool fully before removing from the sheet and transferring to a jar or container. The granola will keep for a couple of weeks in a sealed container at room temperature.
Notes
• Honey can be substituted for the maple syrup, but will make a sweeter granola.