Preheat oven to 300 degrees F. Line a large rimmed baking sheet with parchment paper or nonstick foil.
In a large bowl, mix together pecans, oats, coconut, seeds, flaxseed, brown sugar and salt.
In a small bowl or glass measuring cup, mix together oil, maple syrup and vanilla. Pour over the oat mixture and stir until evenly coated.
Spread mixture on the pan pressing flat and evenly.
Bake for a total of 40 minutes. After the first 15 minutes, use a spatula to flip the edges in toward the middle, then stir the granola again to prevent burning. Repeat after another 15 minutes.