Preheat oven to 250℉. In a large bowl, mix together the rolled oats, wants, cashews, brown sugar, cocoa powder and kosher salt. Set aside.
In a small bowl, combine the vegetable oil, maple syrup, and vanilla extract until well mixed. Pour this over the set aside dry ingredients until the dry ingredients are wet. Spread the mixture on a baking sheet and put in the oven.
Bake for 1 hour. Halfway through, remove from the oven and stir the mixture to evenly bake. 5 minutes before baking time is over, remove from oven and sprinkle the chocolate chunks evenly over the top of the granola. Sprinkle the sea salt on top of the chocolate and return to the oven.
Remove from the oven and allow to completely cool before transferring to a container.