Preheat the oven to 300°. Line a rimmed baking sheet with parchment paper.
Combine the oats, pecans, walnuts, almonds, sunflower seeds, pepitas, and salt in a large mixing bowl. Add the maple syrup, tossing to coat all components.
Spread the mixture on prepared baking sheet. Bake 30 - 45 minutes, stirring often, until toasted and crisp.
Cool completely and store in airtight container.
Notes
Store the cooled granola in an airtight container for up to 2 weeks. For longer storage, store in the freezer.If using salted nuts, adjust the salt added to the recipe.Nutritional values are approximate and based on ⅓ cup.