Preheat oven to 250 (the lowest my oven is marked is 260, so I used that.) Line a large baking sheet with parchment paper or a silpat liner.
In a large bowl, mix together the oats, coconut, cocoa powder and brown sugar.
In a separate bowl or liquid measuring cup, combine honey, butter, vanilla, and salt.
Pour the wet ingredients over the dry and stir until combined. Spread mixture evenly on the baking sheet.
Bake for 30 minutes, stir and return to the oven to bake for another 30-45 minutes. The granola will be fragrant and slightly crisp.
Remove from the oven and immediately sprinkle with chocolate chips and stir to slightly mix them in. Let the granola set while the chocolate chips melt and then cool, this will be about 1-2 hours (you can put the baking sheet in the refrigerator to speed this up).
Break any large pieces up and store the granola in an airtight container.