Preheat the oven to 300ºF and line a baking sheet with parchment paper.
In a large bowl, combine the nuts, coconut, sunflower seeds, and cacao nibs.
In a different mixing bowl or large measuring cup, whisk together the egg white with the water until bubbly and slightly foamy.
Add the coconut oil, cocoa powder, maple syrup, almond butter, vanilla extract, and salt to the egg white/water mixture and whisk together well until combined. Pour over the dry ingredients and stir everything until well coated.
Spread the granola mixture evenly on the parchment-lined baking sheet and bake for 35 to 40 minutes or until dry to the touch and crispy, rotating the pan once after 20 minutes.
Remove granola from the oven, sprinkle with chopped chocolate, and allow it to sit undisturbed until completely cool. Once cool, use a spatula to get under the granola and break up into large clusters.
Store the granola in an air-sealed container for up to 1 month.