Preheat the oven to 325 degrees F (165 degrees C).
Mix rolled and quick-cooking oats, pecans, walnuts, almonds, and pepitas together and spread out on a sheet pan.
Bake in the preheated oven for 10 minutes. Remove from the oven and transfer to a large mixing bowl. Reduce oven temperature to 225 degrees F (110 degrees C).
Mix maple syrup, coconut oil, crystallized ginger, turmeric, ground ginger, cinnamon, salt, cardamom, and pepper together in a smaller bowl and pour over the oats and nuts. Mix thoroughly, then pour mixture back onto the baking sheet.
Bake in the oven for 30 minutes. Turn oven off and leave granola in for 1 hour.
Remove from the oven and let cool to room temperature, about 30 minutes.