Preheat oven to 340 degrees. Line 2 baking sheets with parchment; set aside.
In a large mixing bowl, add oats, nuts, seeds, dry spices, sugar and salt; stir to combine.
In a small pan over low heat, add oil, maple syrup and pumpkin puree; whisk to combine. Once warm, pour it over the dry ingredients and mix with a sturdy spoon (work quickly because it cools quickly).
Transfer equal amounts of the mixture to each baking sheet.
Bake 25-30 minutes. Rotate the pans halfway during the cooking time. Remove from oven when nicely browned but not burned; allow to cool on baking sheets so it gets crispy.
When thoroughly cool, transfer granola to a lidded container and enjoy!