Preheat oven to 300ºF. Line a large baking sheet with parchment paper or a silicone baking liner.
Pour mixture onto prepared pan and spread into an even layer. Bake for 45-55 minutes, rotating the pan halfway through to ensure even cooking. Remove from oven and allow to cool entirely (I like to press mine down a bit right when it gets out of the oven so I get chunky granola, depends on your preference).
When it's fully cooled, transfer to an airtight container to store for up to a month, if it lasts that long! Will last even longer in the refrigerator or freezer.