Preheat your oven to 325°F (160°C) and line a large baking sheet with parchment paper.
In a large mixing bowl, combine the rolled oats, chopped walnuts, pumpkin seeds, and sunflower seeds.
In a separate bowl, whisk together the maple syrup, melted coconut oil, egg white (or aquafaba for vegan version), vanilla extract, cinnamon, and salt until well combined.
Pour the wet mixture over the dry ingredients and stir thoroughly until everything is evenly coated.
Spread the mixture in an even layer on the prepared baking sheet, pressing it down firmly with a spatula to create a compact layer. This helps form clusters.
Bake for 25-30 minutes, or until the granola is golden brown, rotating the pan halfway through baking time.
Remove from the oven and let cool completely on the baking sheet without stirring. This is crucial for cluster formation.
Once completely cooled, break the granola into clusters of your desired size.
If using, mix in the dried cranberries or other dried fruits.
Store in an airtight container at room temperature for up to 2 weeks, or freeze for longer storage.