Preheat oven to 300℉. Line a rimmed baking sheet with parchment paper.
In a large bowl, combine oats, nuts, seeds, salt, and cinnamon.
In a separate bowl, combine maple syrup, brown sugar, vanilla, and oil. Add wet mixture to oats. Mix well.
Transfer granola to baking sheet. Spread into an even, thin layer in the middle and have the edges slightly thicker. (This will prevent the outer edges from burning since they cook faster.) For clumpy granola, press granola down so the pieces stick together.
On the middle rack, bake for 45 minutes to 1 hour, or until granola is medium brown. Do not stir.
Let granola cool completely. Granola will continue to harden and crisp up as it cools.
Break up granola using your hands or a metal spatula. Mix in dried fruit and any other add-ins of your choice, such as chia seeds, coconut flakes, or chocolate chips.