In a large mixing bowl, place oats, chopped hazelnuts, chopped almonds, cocoa powder, brown sugar and a pinch of salt. Add the wet ingredients: silan or maple, oil and water, and mix well until the mixture is fully and evenly covered.
Spread the mixture over a large baking pan lined with baking paper and bake for about 35 minutes, during which time carefully mix the mixture at least once.
Cool the granola completely. Then, stir in the chocolate chips (or dark chocolate chopped in the same amount).
Keep in a sealed container for at least two weeks.